Bump version to 0.4.0-alpha.0

Virtual methods

Cargo.lock

@@ -476,7 +476,7 @@ dependencies = [
 
 [[package]]
 name = "mist-analyzer"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 dependencies = [
  "cargo_metadata",
  "dashmap 6.1.0",
@@ -495,7 +495,7 @@ dependencies = [
 
 [[package]]
 name = "mist-api"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 dependencies = [
  "cargo_metadata",
  "mist-codegen",
@@ -507,7 +507,7 @@ dependencies = [
 
 [[package]]
 name = "mist-codegen"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 dependencies = [
  "bytecount",
  "mist-parser",
@@ -515,7 +515,7 @@ dependencies = [
 
 [[package]]
 name = "mist-lang"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 dependencies = [
  "mist-analyzer",
  "mist-api",
@@ -524,7 +524,7 @@ dependencies = [
 
 [[package]]
 name = "mist-parser"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 dependencies = [
  "pest",
  "pest_derive",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mist-lang"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 edition = "2024"
 description = "The Mist programming language compiler"
 license = "Apache-2.0"
@@ -33,10 +33,10 @@ exclude = [
 ]
 
 [workspace.dependencies]
-mist-parser = { path = "crates/parser", version = "0.3.8-alpha.0" }
-mist-analyzer = { path = "crates/analyzer", version = "0.3.8-alpha.0" }
-mist-codegen = { path = "crates/codegen", version = "0.3.8-alpha.0" }
-mist-api = { path = "crates/mist-api", version = "0.3.8-alpha.0" }
+mist-parser = { path = "crates/parser", version = "0.4.0-alpha.0" }
+mist-analyzer = { path = "crates/analyzer", version = "0.4.0-alpha.0" }
+mist-codegen = { path = "crates/codegen", version = "0.4.0-alpha.0" }
+mist-api = { path = "crates/mist-api", version = "0.4.0-alpha.0" }
 
 [[bin]]
 name = "mist"

README.md

@@ -5,7 +5,7 @@ Originally this readme was part of the Carbon Language project, licensed with Ap
 -->
 
 <p align="center">
-  <a href="https://mist.selimaj.dev">Documentation</a>
+  <a href="https://mist.selimaj.dev/docs">Documentation</a> ∙ <a href="https://mist.selimaj.dev/blog">Blog</a> ∙ <a href="https://mist.selimaj.dev/faq">FAQ</a>
 </p>
 
 

crates/analyzer/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mist-analyzer"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 edition = "2024"
 description = "The Mist programming language Analyzer LSP"
 license = "Apache-2.0"

crates/analyzer/src/lib.rs

@@ -26,7 +26,7 @@ use crate::transpiler::{
 
 static MARKER_COUNTER: AtomicU64 = AtomicU64::new(0);
 
-const KEYWORDS: [&'static str; 22] = [
+const KEYWORDS: [&'static str; 23] = [
     "if",
     "else",
     "for",
@@ -49,6 +49,7 @@ const KEYWORDS: [&'static str; 22] = [
     "override",
     "module ",
     "void ",
+    "virtual ",
 ];
 
 fn keyword_completion_items() -> impl Iterator<Item = CompletionItem> {
@@ -1630,11 +1631,11 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
     // Struct/Class
     // =========================
 
-    if matches!(curr_scope, Scope::Struct) {
+    if matches!(curr_scope, Scope::Class) {
         items.push(CompletionItem {
-            label: "field".into(),
+            label: "virtual".into(),
             kind: Some(CompletionItemKind::SNIPPET),
-            insert_text: Some("$1 $2,".into()),
+            insert_text: Some("pub virtual $1 $2()\n{\n\t$3\n}".into()),
             insert_text_format: Some(InsertTextFormat::SNIPPET),
             sort_text: Some("0000".into()),
             preselect: Some(true),
@@ -1642,9 +1643,19 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
         });
 
         items.push(CompletionItem {
-            label: "pub field".into(),
+            label: "override".into(),
             kind: Some(CompletionItemKind::SNIPPET),
-            insert_text: Some("pub $1 $2,".into()),
+            insert_text: Some("$1 $2() override$3\n{\n\t$4\n}".into()),
+            insert_text_format: Some(InsertTextFormat::SNIPPET),
+            sort_text: Some("0000".into()),
+            preselect: Some(true),
+            ..Default::default()
+        });
+
+        items.push(CompletionItem {
+            label: "virtual override".into(),
+            kind: Some(CompletionItemKind::SNIPPET),
+            insert_text: Some("pub virtual $1 $2() override$3\n{\n\t$4\n}".into()),
             insert_text_format: Some(InsertTextFormat::SNIPPET),
             sort_text: Some("0000".into()),
             preselect: Some(true),
@@ -1652,7 +1663,8 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
         });
     }
 
-    if matches!(curr_scope, Scope::Class) {
+
+    if matches!(curr_scope, Scope::Class | Scope::Struct) {
         items.push(CompletionItem {
             label: "field".into(),
             kind: Some(CompletionItemKind::SNIPPET),
@@ -1682,7 +1694,7 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
         items.push(CompletionItem {
             label: "variant".into(),
             kind: Some(CompletionItemKind::SNIPPET),
-            insert_text: Some("$1,".into()),
+            insert_text: Some("$1;".into()),
             insert_text_format: Some(InsertTextFormat::SNIPPET),
             sort_text: Some("0000".into()),
             preselect: Some(true),
@@ -1692,7 +1704,7 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
         items.push(CompletionItem {
             label: "tuple variant".into(),
             kind: Some(CompletionItemKind::SNIPPET),
-            insert_text: Some("$1($2),".into()),
+            insert_text: Some("$1($2);".into()),
             insert_text_format: Some(InsertTextFormat::SNIPPET),
             sort_text: Some("0000".into()),
             preselect: Some(true),
@@ -1702,7 +1714,7 @@ fn mist_ify_completions(source: &str, pos: &Position, items: &mut Vec<Completion
         items.push(CompletionItem {
             label: "struct variant".into(),
             kind: Some(CompletionItemKind::SNIPPET),
-            insert_text: Some("$1\n{\n\t$0\n},".into()),
+            insert_text: Some("$1\n{\n\t$0\n};".into()),
             insert_text_format: Some(InsertTextFormat::SNIPPET),
             sort_text: Some("0000".into()),
             preselect: Some(true),
@@ -2024,10 +2036,7 @@ fn compute_mod_decls(
                     let source = rope.to_string();
                     parse_module(&source).ok().flatten().map(|(_, name)| name.0)
                 })
-                .or_else(|| {
-                    file.file_stem()
-                        .and_then(|s| s.to_str().map(String::from))
-                });
+                .or_else(|| file.file_stem().and_then(|s| s.to_str().map(String::from)));
             if let Some(name) = mod_name {
                 mod_decl.push_str(&format!("pub mod {};\n", name));
             }

crates/codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mist-codegen"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 edition = "2024"
 description = "The Mist programming language Rust code generator"
 license = "Apache-2.0"

crates/codegen/src/class_decl.rs

@@ -16,7 +16,7 @@ pub struct ClassProcessedData {
     items: Vec<ClassItem>,
     methods: Vec<Spanned<FunctionDecl>>,
     v_table: Vec<Identifier>,
-    override_v_table: HashMap<Override, Spanned<Vec<Identifier>>>,
+    override_v_table: HashMap<Override, Spanned<Vec<(Identifier, bool)>>>,
 }
 
 impl ClassProcessedData {
@@ -51,7 +51,7 @@ impl ClassProcessedData {
             if matches!(method.item.visibility, Visibility::Public) {
                 match &method.item.is_override {
                     None => {
-                        if method.item.self_param.is_some() {
+                        if method.item.is_virtual && method.item.self_param.is_some() {
                             v_table.push(method.item.name.clone());
                         }
                     }
@@ -64,7 +64,7 @@ impl ClassProcessedData {
                                 item: Vec::new(),
                             })
                             .item
-                            .push(method.item.name.clone());
+                            .push((method.item.name.clone(), method.item.is_virtual));
                     }
                 }
             }
@@ -191,13 +191,13 @@ impl ClassProcessedData {
                     .as_ref()
                     .unwrap_or(self.inherits.as_ref().unwrap())
                     .get_rust();
-                for method_ident in &overriden_method_idents.item {
+                for (method_ident, is_virtual) in &overriden_method_idents.item {
                     cg.add_indentedln(&format!(
-                        "table[{}::__FN_{}] = {}::__m_{} as *const std::ffi::c_void;",
+                        "table[{}::__FN_{}] = {}::{} as *const std::ffi::c_void;",
                         base_class_path,
                         method_ident.0.to_uppercase(),
                         self.self_path.get_rust(),
-                        method_ident.get_rust()
+                        get_virtual_name(method_ident, *is_virtual)
                     ));
                 }
             }
@@ -352,8 +352,9 @@ impl ClassProcessedData {
         for field in &self.fields {
             if let Some(init) = &field.item.init {
                 field.gen_span(cg);
-                cg.add_indentedln(&format!("this.{} = ", field.item.decl.name.get_rust()));
+                cg.add_indented(&format!("this.{} = ", field.item.decl.name.get_rust()));
                 init.gen_rust(ctx, cg);
+                cg.addln(";");
             }
         }
 
@@ -379,6 +380,7 @@ impl ClassProcessedData {
             column: constructor.column,
             item: FunctionDecl {
                 visibility: constructor.item.visibility.clone(),
+                is_virtual: false,
                 is_override: None,
                 name: Identifier(String::from("constructor")),
                 generics: constructor.item.generics.clone(),
@@ -395,7 +397,7 @@ impl ClassProcessedData {
         for method in &self.methods {
             match method.item.visibility {
                 Visibility::Public => {
-                    if method.item.self_param.is_some() {
+                    if method.item.is_virtual && method.item.self_param.is_some() {
                         if method.item.is_override.is_none() {
                             gen_method_point(&method.item, ctx, cg);
                         }
@@ -616,3 +618,11 @@ pub fn get_type_from_path(path: &ExprPath) -> TypeExpr {
         path.0.last().unwrap().generics.clone(),
     )
 }
+
+pub fn get_virtual_name(name: &Identifier, is_virtual: bool) -> String {
+    if is_virtual {
+        format!("__m_{}", name.get_rust())
+    } else {
+        name.get_rust()
+    }
+}

crates/codegen/src/lib.rs

@@ -3,7 +3,7 @@ pub mod expr;
 pub mod statement;
 pub mod top_level;
 
-use std::path::PathBuf;
+use std::{collections::HashMap, path::PathBuf};
 
 use mist_parser::{
     ast::*,
@@ -26,9 +26,15 @@ pub trait GetRust {
     }
 }
 
+pub enum Include {
+    Glob(Path),
+    Use(Visibility, Path),
+}
+
 pub struct RustCodegen {
     output: String,
     indent: usize,
+    pub crates: HashMap<Identifier, Vec<Include>>,
     pub mapping: Mapping,
     position: RustMap,
 }
@@ -38,6 +44,7 @@ impl RustCodegen {
         Self {
             output: String::new(),
             indent: 0,
+            crates: HashMap::new(),
             mapping: Mapping::new(mist_path),
             position: RustMap(1, 0),
         }
@@ -78,14 +85,45 @@ impl RustCodegen {
     }
 
     pub fn generate(&mut self, toplevels: Vec<TopLevel>) -> String {
-        let mut ctx = Context {
-            expr_super: None,
-        };
+        let mut ctx = Context { expr_super: None };
 
         for tl in toplevels {
             tl.gen_rust(&mut ctx, self);
         }
 
+        let mut crates = HashMap::new();
+        std::mem::swap(&mut self.crates, &mut crates);
+
+        for (c, items) in crates {
+            self.add("mod ");
+            c.gen_rust(&mut ctx, self);
+            self.addln(" {");
+            self.indent += 1;
+
+            self.add_indented("extern crate ");
+            c.gen_rust(&mut ctx, self);
+            self.addln(";");
+
+            for item in items {
+                self.add_indentedln("#[doc(inline)]");
+                self.add_indented("pub use ");
+                match item {
+                    Include::Glob(item) => {
+                        item.gen_rust(&mut ctx, self);
+                        self.add("::*");
+                    }
+                    Include::Use(vis, item) => {
+                        vis.gen_rust(&mut ctx, self);
+                        item.gen_rust(&mut ctx, self);
+                    }
+                }
+                self.addln(";");
+            }
+
+            self.indent -= 1;
+            self.addln("}");
+        }
+
         self.output.clone()
     }
 
@@ -275,6 +313,13 @@ impl GetRust for TypeExpr {
                     return_type.get_rust(),
                 )
             }
+            Self::Array(ty, count) => {
+                if let Some(count) = count {
+                    format!("[{}; {count}]", ty.get_rust())
+                } else {
+                    format!("[{}]", ty.get_rust())
+                }
+            }
         }
     }
 }

crates/codegen/src/statement.rs

@@ -188,8 +188,19 @@ impl GenRust for Statement {
 
 impl GenRust for VarDecl {
     fn gen_rust(&self, ctx: &mut Context, cg: &mut RustCodegen) {
+        if self.tuple_names.is_empty() {
             self.name.gen_rust(ctx, cg);
+        } else {
+            cg.add("(");
+            self.name.gen_rust(ctx, cg);
+            for name in &self.tuple_names {
+                cg.add(", ");
+                name.gen_rust(ctx, cg);
+            }
+            cg.add(")");
+        }
 
+        if self.true_type {
             cg.add(
                 &self
                     .type_
@@ -197,5 +208,21 @@ impl GenRust for VarDecl {
                     .map(|t| format!(": {}", t.get_rust()))
                     .unwrap_or_default(),
             );
+        } else {
+            cg.add(
+                &self
+                    .type_
+                    .as_ref()
+                    .map(|t| {
+                        let t = vec![t.get_rust(); self.tuple_names.len() + 1];
+                        if self.tuple_names.is_empty() {
+                            format!(": {}", t.join(", "))
+                        } else {
+                            format!(": ({})", t.join(", "))
+                        }
+                    })
+                    .unwrap_or_default(),
+            );
+        }
     }
 }

crates/codegen/src/top_level.rs

@@ -326,6 +326,23 @@ impl GenRust for TopLevelKind {
                 constructor,
                 items,
             ),
+            Self::IncludeGlobal(incl) => {
+                cg.crates
+                    .entry(incl.0[0].clone())
+                    .or_insert(Vec::new())
+                    .push(crate::Include::Glob(incl.clone()));
+            }
+            Self::IncludeUse(vis, incl) => {
+                cg.crates
+                    .entry(incl.0[0].clone())
+                    .or_insert(Vec::new())
+                    .push(crate::Include::Use(vis.clone(), incl.clone()));
+            }
+            Self::IncludeLocal(path) => {
+                cg.add("include!(\"");
+                cg.add(&path.replace(".mist", ".rs"));
+                cg.add("\");");
+            }
         }
     }
 }

crates/mist-api/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mist-api"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 edition = "2024"
 description = "The Mist programming language module system"
 license = "Apache-2.0"

crates/parser/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mist-parser"
-version = "0.3.8-alpha.0"
+version = "0.4.0-alpha.0"
 edition = "2024"
 description = "The Mist programming language parser"
 license = "Apache-2.0"

crates/parser/src/ast/mod.rs

@@ -48,6 +48,7 @@ pub enum TypeExpr {
         return_type: Box<TypeExpr>,
         params: Vec<TypeExpr>,
     },
+    Array(Box<TypeExpr>, Option<isize>)
 }
 
 #[derive(Debug, Clone, Serialize)]

crates/parser/src/ast/statement.rs

@@ -44,8 +44,10 @@ pub struct MatchItem(pub Vec<Pattern>, pub Expression);
 
 #[derive(Debug, Clone, Serialize)]
 pub struct VarDecl {
-    pub name: Pattern,
     pub type_: Option<TypeExpr>,
+    pub name: Pattern,
+    pub true_type: bool,
+    pub tuple_names: Vec<Pattern>,
 }
 
 #[derive(Debug, Clone, Serialize)]

crates/parser/src/ast/top_level.rs

@@ -28,6 +28,9 @@ pub struct TopLevel(pub Spanned<TopLevelKind>, pub Vec<Attribute>);
 pub enum TopLevelKind {
     ModAttribute,
     Import(Visibility, Path),
+    IncludeGlobal(Path),
+    IncludeUse(Visibility, Path),
+    IncludeLocal(String),
     DeclareModule(Visibility, Identifier),
     ImplDecl(ImplDecl),
     StaticDecl(VarDeclStmt),
@@ -104,12 +107,13 @@ pub struct Override(pub Option<ExprPath>);
 #[derive(Debug, Clone, Serialize)]
 pub struct FunctionDecl {
     pub visibility: Visibility,
-    pub is_override: Option<Override>,
+    pub is_virtual: bool,
+    pub return_type: Option<TypeExpr>,
     pub name: Identifier,
     pub generics: GenericsDecl,
     pub self_param: Option<(bool, Option<Identifier>, bool)>,
     pub params: ParamList,
-    pub return_type: Option<TypeExpr>,
+    pub is_override: Option<Override>,
     pub body: Option<Block>,
 }
 

crates/parser/src/error.rs

@@ -24,6 +24,7 @@ pub enum ErrorCode {
     InvalidStatement,
     AstGenBug,
     Module,
+    NumberParse,
 }
 
 impl From<pest::error::Error<Rule>> for ParseError<'_> {

crates/parser/src/grammar.pest

@@ -36,6 +36,7 @@ keyword = {
   | "override"
   | "const"
   | "type"
+  | "virtual"
 }
 
 identifier = @{
@@ -141,8 +142,12 @@ void_type = {
     "void"
 }
 
+array_type = {
+    "[" ~ integer? ~ "]"
+}
+
 type_expr = {
-    (void_type | path_type | tuple_type | dyn_type) ~ (unsafe_ref_type | ref_type | fn_type)*
+    (void_type | path_type | tuple_type | dyn_type) ~ (unsafe_ref_type | ref_type | fn_type | array_type)*
 }
 
 lifetime = {
@@ -225,9 +230,12 @@ attributes = {
 // ======================================================
 // DECLARATION HELPERS
 // ======================================================
+as_kw = { "as" }
+
 var_decl = {
-    ("let" ~ pattern)
-  | type_expr ~ (!tuple_pattern ~ pattern)
+    ("let" ~ pattern ~ ("," ~ pattern)*)
+  | (type_expr ~ as_kw ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)+))
+  | (type_expr ~ (!tuple_pattern ~ pattern ~ ("," ~ pattern)*))
 }
 
 field = {
@@ -240,7 +248,7 @@ param = {
 }
 
 field_list = {
-    (field ~ ("," ~ field)* ~ ","?)?
+    (field ~ ";")*
 }
 
 param_list = {
@@ -251,6 +259,18 @@ param_list = {
 // IMPORTS / MODULES
 // ======================================================
 
+include_global = {
+    "#" ~ "include" ~ "<" ~ identifier ~ ("/" ~ identifier)* ~ ">"
+}
+
+include_use_global = {
+    visibility? ~ "#" ~ "use" ~ static_path ~ semicolon
+}
+
+include_local = {
+    "#" ~ "include" ~ string_lit
+}
+
 import = {
     visibility? ~ "use" ~ static_path ~ semicolon
 }
@@ -264,7 +284,7 @@ declare_module = {
 // ======================================================
 
 struct_decl = {
-    visibility? ~ "struct" ~ identifier ~ generics_decl? ~ "{" ~ field_list? ~ "}"
+    visibility? ~ "struct" ~ identifier ~ generics_decl? ~ "{" ~ field_list ~ "}"
 }
 
 // ======================================================
@@ -289,12 +309,8 @@ enum_field = _{
   | enum_named
 }
 
-enum_fields = _{
-    enum_field ~ ("," ~ enum_field)* ~ ","?
-}
-
 enum_decl = {
-    visibility? ~ "enum" ~ identifier ~ generics_decl? ~ "{" ~ enum_fields? ~ "}"
+    visibility? ~ "enum" ~ identifier ~ generics_decl? ~ "{" ~ (enum_field ~ ";")* ~ "}"
 }
 
 // ======================================================
@@ -358,10 +374,12 @@ trait_decl = {
 // FUNCTIONS
 // ======================================================
 
+virtual_kw = { "virtual" }
+
 override_kw = { "override" ~ ("(" ~ expr_path ~ ")")? }
 
 function_decl = {
-    visibility? ~ ("void" | type_expr) ~ identifier ~ generics_decl? ~ "(" ~ method_args ~ ")" ~ override_kw? ~ (block | semicolon)
+    visibility? ~ virtual_kw? ~ ("void" | type_expr) ~ identifier ~ generics_decl? ~ "(" ~ method_args ~ ")" ~ override_kw? ~ (block | semicolon)
 }
 
 // ======================================================
@@ -381,7 +399,7 @@ type_alias = { "type" ~ identifier ~ generics_decl? ~ "=" ~ type_expr ~ ";" }
 
 top_level = {
     mod_attribute
-  | (attributes ~ (import | impl_for_decl | impl_decl | trait_decl | struct_decl | enum_decl | class_decl | declare_module | function_decl | const_decl | static_decl | type_alias))
+  | (attributes ~ (include_global | include_local | include_use_global | import | impl_for_decl | impl_decl | trait_decl | struct_decl | enum_decl | class_decl | declare_module | function_decl | const_decl | static_decl | type_alias))
 }
 
 // ======================================================

crates/parser/src/parser/common/decl.rs

@@ -2,7 +2,7 @@ use crate::{
     Rule,
     ast::*,
     error::{AstError, collect_recovered},
-    parser::consume_rule,
+    parser::{consume_rule, listen_rule},
 };
 
 impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDeclStmt {
@@ -55,7 +55,9 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for VarDecl {
                     type_: consume_rule(&mut inner, Rule::type_expr)
                         .map(TypeExpr::try_from)
                         .transpose()?,
+                    true_type: listen_rule(&mut inner, Rule::as_kw),
                     name: Pattern::try_from(inner.next().unwrap())?,
+                    tuple_names: collect_recovered(inner)?,
                 })
             }
 

crates/parser/src/parser/common/types.rs

@@ -50,6 +50,25 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExpr {
                             };
                         }
 
+                        Rule::array_type => {
+                            ty = TypeExpr::Array(
+                                Box::new(ty),
+                                ref_inner
+                                    .next()
+                                    .map(|v| {
+                                        v.as_str().parse().map_err(|_| AstError {
+                                            span: v.as_span(),
+                                            error_code: crate::error::ErrorCode::NumberParse,
+                                            error_message: format!(
+                                                "Number exceeds isize limits: {}",
+                                                v.as_str()
+                                            ),
+                                        })
+                                    })
+                                    .transpose()?,
+                            )
+                        }
+
                         _ => AstError::bug_unimplemented(ref_pair)?,
                     }
                 }

crates/parser/src/parser/items/function.rs

@@ -14,6 +14,8 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
         let mut inner = pair.into_inner();
             let visibility = Visibility::try_from(&mut inner)?;
 
+            let is_virtual = listen_rule(&mut inner, Rule::virtual_kw);
+
             let return_type = consume_rule(&mut inner, Rule::type_expr)
                 .map(TypeExpr::try_from)
                 .transpose()?;
@@ -45,12 +47,13 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for FunctionDecl {
 
             Ok(Self {
                 visibility: visibility,
-                is_override: is_override,
+                is_virtual: is_virtual,
                 return_type: return_type,
                 name: name,
                 generics: generics,
                 self_param: self_param,
                 params: params,
+                is_override: is_override,
                 body: body,
             })
         })

crates/parser/src/parser/items/mod.rs

@@ -54,11 +54,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TopLevelKind {
                     .transpose()
                     .map(|v| v.unwrap_or_default())?,
 
-                fields: inner
-                    .next()
-                    .map(|pair| collect_recovered(pair.into_inner()))
-                    .transpose()
-                    .map(|v| v.unwrap_or_default())?,
+                fields: collect_recovered(inner.next().unwrap().into_inner())?,
             }),
 
             Rule::class_decl => Ok(TopLevelKind::ClassDecl {
@@ -133,6 +129,25 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TopLevelKind {
                 ty: inner.next().unwrap().try_into()?,
             }),
 
+            Rule::include_global => Ok(TopLevelKind::IncludeGlobal(Path(collect_recovered(
+                &mut inner,
+            )?))),
+
+            Rule::include_use_global => Ok(TopLevelKind::IncludeUse(
+                Visibility::try_from(&mut inner)?,
+                Path::try_from(inner.next().unwrap())?,
+            )),
+
+            Rule::include_local => Ok(TopLevelKind::IncludeLocal(
+                inner
+                    .next()
+                    .unwrap()
+                    .into_inner()
+                    .next()
+                    .unwrap()
+                    .to_string(),
+            )),
+
             _ => AstError::bug_unimplemented(pair),
         }
     }

crates/parser/src/semantics.rs

@@ -46,10 +46,13 @@ pub fn check_class_semantics<'a>(top_level: &TopLevel) -> Result<(), Vec<Semanti
         if let Some(constructor) = constructor {
             let mut fields = fields
                 .iter()
-                .map(|field| Spanned {
+                .filter_map(|field| match field.item.init {
+                    Some(_) => None,
+                    None => Some(Spanned {
                         item: field.item.decl.name.clone(),
                         line: field.line,
                         column: field.column,
+                    }),
                 })
                 .collect::<Vec<_>>();
 
@@ -99,6 +102,28 @@ pub fn check_class_semantics<'a>(top_level: &TopLevel) -> Result<(), Vec<Semanti
         }
 
         Ok(())
+    } else if let TopLevelKind::FunctionDecl(decl) = &top_level.0.item {
+        if decl.is_virtual && decl.is_override.is_some() {
+            Err(vec![SemanticError {
+                line: top_level.0.line,
+                column: top_level.0.column,
+                error_message: "virtual and override are only used in classes".to_string(),
+            }])
+        } else if decl.is_virtual {
+            Err(vec![SemanticError {
+                line: top_level.0.line,
+                column: top_level.0.column,
+                error_message: "virtual is only used in classes".to_string(),
+            }])
+        } else if decl.is_override.is_some() {
+            Err(vec![SemanticError {
+                line: top_level.0.line,
+                column: top_level.0.column,
+                error_message: "override is only used in classes".to_string(),
+            }])
+        } else {
+            Ok(())
+        }
     } else {
         Ok(())
     }

mist-test/src/common/decl_test.mist

@@ -1,5 +1,4 @@
 pub module decl_test;
-pub module decl_test;
 
 pub void test_let_basic()
 {
@@ -7,6 +6,13 @@ pub void test_let_basic()
     assert_eq!(x, 42);
 }
 
+pub void test_let_repeat()
+{
+    let x, y = (42, 67);
+    assert_eq!(x, 42);
+    assert_eq!(y, 67);
+}
+
 pub void test_let_typed()
 {
     i32 x = 42;
@@ -19,6 +25,29 @@ pub void test_let_typed()
     assert_eq!(f, 3.14);
 }
 
+pub void test_let_repeat_typed()
+{
+    i32 x, x1 = (42, 67);
+    assert_eq!(x, 42);
+    assert_eq!(x1, 67);
+
+    str& s, s1 = ("hello", "world");
+    assert_eq!(s, "hello");
+    assert_eq!(s1, "world");
+
+    bool b, b1 = (true, false);
+    assert_eq!(b, true);
+    assert_eq!(b1, false);
+
+    f64 f, f1 = (3.14, 5.5);
+    assert_eq!(f, 3.14);
+    assert_eq!(f1, 5.5);
+
+    (i32, f64) as a, b = (70, 1.4);
+    assert_eq!(a, 70);
+    assert_eq!(b, 1.4);
+}
+
 pub void test_let_mut()
 {
     let mut _x = 42;
@@ -77,10 +106,33 @@ pub void test_let_bool()
     assert_eq!(t, !f);
 }
 
+pub void test_let_decl_only()
+{
+    let x;
+    x = 42;
+    assert_eq!(x, 42);
+}
+
+pub void test_let_typed_decl_only()
+{
+    i32 x;
+    x = 100;
+    assert_eq!(x, 100);
+}
+
+pub void test_let_decl_mut_no_init()
+{
+    let mut x;
+    x = 5;
+    assert_eq!(x, 5);
+}
+
 pub void run_tests()
 {
     test_let_basic();
+    test_let_repeat();
     test_let_typed();
+    test_let_repeat_typed();
     test_let_mut();
     test_let_tuple_destructure();
     test_let_nested_tuple();
@@ -89,4 +141,7 @@ pub void run_tests()
     test_let_with_type_and_init();
     test_string_literal();
     test_let_bool();
+    test_let_decl_only();
+    test_let_typed_decl_only();
+    test_let_decl_mut_no_init();
 }

mist-test/src/common/expr_test.mist

@@ -1,5 +1,4 @@
 pub module expr_test;
-pub module expr_test;
 
 pub void test_literals()
 {
@@ -156,6 +155,63 @@ pub void test_binary_assign()
     assert_eq!(x, 2);
 }
 
+pub void test_binary_assign_bit()
+{
+    let mut x = 10;
+    x &= 12;
+    assert_eq!(x, 8);
+    x |= 1;
+    assert_eq!(x, 9);
+    x ^= 3;
+    assert_eq!(x, 10);
+    let mut y = 8;
+    y <<= 2;
+    assert_eq!(y, 32);
+    y >>= 1;
+    assert_eq!(y, 16);
+}
+
+pub void test_empty_tuple()
+{
+    let t = ();
+    assert_eq!(t, ());
+}
+
+pub void test_empty_array()
+{
+    let arr = [0; 0];
+    assert_eq!(arr.len(), 0);
+}
+
+pub void test_range_inclusive()
+{
+    let mut sum = 0;
+    for i in 1 ..= 3 {
+        sum += i;
+    }
+    assert_eq!(sum, 6);
+}
+
+pub void test_closure_no_args()
+{
+    let f = () => 42;
+    assert_eq!(f(), 42);
+}
+
+pub void test_closure_with_typed_params()
+{
+    let add = (i32 a, i32 b) => a + b;
+    assert_eq!(add(3, 4), 7);
+}
+
+pub void test_mut_ref()
+{
+    let mut x = 42;
+    let r = &mut x;
+    *r = 100;
+    assert_eq!(x, 100);
+}
+
 pub void run_tests()
 {
     test_literals();
@@ -175,4 +231,11 @@ pub void run_tests()
     test_if_expr();
     test_range_expr();
     test_binary_assign();
+    test_binary_assign_bit();
+    test_empty_tuple();
+    test_empty_array();
+    test_range_inclusive();
+    test_closure_no_args();
+    test_closure_with_typed_params();
+    test_mut_ref();
 }

mist-test/src/common/package.mist

@@ -1,4 +1,3 @@
-pub module package;
 pub module common;
 
 pub void test_package() {}

mist-test/src/common/statement_test.mist

@@ -1,5 +1,4 @@
 pub module statement_test;
-pub module statement_test;
 
 pub void test_var_decl()
 {
@@ -161,6 +160,68 @@ pub void test_for_with_pattern_destructure()
     assert_eq!(keys, 3);
 }
 
+pub void test_c_for_loop()
+{
+    let mut sum = 0;
+    for (let mut i = 0; i < 4; i++) {
+        sum += i;
+    }
+    assert_eq!(sum, 6);
+}
+
+pub void test_unsafe_block()
+{
+    let mut x = 42;
+    unsafe {
+        let r = &mut x;
+        *r = 100;
+    }
+    assert_eq!(x, 100);
+}
+
+pub void test_match_parenthesized()
+{
+    let result;
+    match (2) {
+        1 => result = 10,
+        2 => result = 20,
+        _ => panic!(),
+    }
+    assert_eq!(result, 20);
+}
+
+pub void test_if_parenthesized()
+{
+    let mut x = 0;
+    if (true) {
+        x = 1;
+    }
+    assert_eq!(x, 1);
+}
+
+pub void test_while_parenthesized()
+{
+    let mut count = 0;
+    while (count < 3) {
+        count++;
+    }
+    assert_eq!(count, 3);
+}
+
+pub void test_loop_with_break_value()
+{
+    let mut x = 0;
+    let result;
+    loop {
+        if x >= 3 {
+            result = x;
+            break;
+        }
+        x++;
+    }
+    assert_eq!(result, 3);
+}
+
 pub void run_tests()
 {
     test_var_decl();
@@ -177,4 +238,10 @@ pub void run_tests()
     test_match_or_pattern();
     test_match_default();
     test_for_with_pattern_destructure();
+    test_c_for_loop();
+    test_unsafe_block();
+    test_match_parenthesized();
+    test_if_parenthesized();
+    test_while_parenthesized();
+    test_loop_with_break_value();
 }

mist-test/src/common/types_test.mist

@@ -1,5 +1,4 @@
 pub module types_test;
-pub module types_test;
 
 pub void test_integer_type() {
     i32 x = 42;
@@ -53,6 +52,30 @@ pub void test_fn_return_type() {
     assert_eq!(add(3, 4), 7);
 }
 
+pub void test_generic_type() {
+    Option<i32> x = Option::Some(42);
+    assert_eq!(x.is_some(), true);
+}
+
+type MyInt = i32;
+
+pub void test_type_alias() {
+    MyInt x = 42;
+    assert_eq!(x, 42);
+}
+
+const i32 MY_CONST = 100;
+
+pub void test_const_decl() {
+    assert_eq!(MY_CONST, 100);
+}
+
+static i32 my_static = 200;
+
+pub void test_static_decl() {
+    assert_eq!(my_static, 200);
+}
+
 pub void run_tests() {
     test_integer_type();
     test_float_type();
@@ -63,4 +86,8 @@ pub void run_tests() {
     test_mut_ref_type();
     test_void_type();
     test_fn_return_type();
+    test_generic_type();
+    test_type_alias();
+    test_const_decl();
+    test_static_decl();
 }

mist-test/src/items/attribute_test.mist

@@ -1,10 +1,9 @@
 pub module attribute_test;
-pub module attribute_test;
 
 #[derive(Debug)]
 pub struct Debuggable
 {
-    i32 value,
+    i32 value;
 }
 
 pub void test_derive_attribute()
@@ -23,8 +22,21 @@ pub void test_allow_attribute()
     assert_eq!(x, 42);
 }
 
+#[allow(dead_code)]
+pub struct Tagged
+{
+    i32 id;
+}
+
+pub void test_attribute_with_args()
+{
+    Tagged t = Tagged { id: 1 };
+    assert_eq!(t.id, 1);
+}
+
 pub void run_tests()
 {
     test_derive_attribute();
     test_allow_attribute();
+    test_attribute_with_args();
 }

mist-test/src/items/class_test.mist

@@ -1,5 +1,8 @@
 pub module class_test;
-pub module class_test;
+
+pub enum AnimalType {
+    Mammal;
+}
 
 pub class Animal
 {
@@ -10,7 +13,11 @@ pub class Animal
         self.name = "Rex".to_string();
     }
 
-    pub String speak(&self)
+    pub virtual AnimalType get_animal_type(&self) {
+        panic!()
+    }
+
+    pub virtual String speak(&self)
     {
         "Unknown".to_string()
     }
@@ -32,6 +39,11 @@ pub class Mammal : Animal
         super = Super::new();
     }
 
+    // override without a target assumes current super
+    pub AnimalType get_animal_type(&self) override {
+        AnimalType::Mammal
+    }
+
     pub void args_test(&self, i32 x, str& y)
     {
         assert_eq!(x, 10);
@@ -60,10 +72,74 @@ pub class Dog : Mammal
     }
 }
 
+pub class Counter
+{
+    pub i32 count;
+
+    constructor()
+    {
+        self.count = 42;
+    }
+
+    i32 get_count(&self)
+    {
+        self.count
+    }
+
+    pub i32 static_fn()
+    {
+        99
+    }
+}
+
+pub void test_class_no_inheritance()
+{
+    Counter c = Counter::new();
+    assert_eq!(c.get_count(), 42);
+}
+
+pub class WithDefault
+{
+    pub String name = "default".to_string();
+    pub i32 value = 42;
+
+    constructor()
+    {
+    }
+
+    pub String get_name(&self)
+    {
+        self.name.clone()
+    }
+}
+
+pub void test_class_field_default()
+{
+    WithDefault w = WithDefault::new();
+    assert_eq!(w.get_name(), "default");
+    assert_eq!(w.value, 42);
+}
+
+pub class EmptyClass
+{
+    constructor()
+    {
+    }
+}
+
+pub void test_class_empty()
+{
+    EmptyClass e = EmptyClass::new();
+}
+
 pub void run_tests()
 {
     let dawg = Dog::new();
     dawg.args_test(10, "hello");
     dawg.test_speak();
+    dawg.get_animal_type();
     assert_eq!(format!("{dawg}"), "🐾 Rex");
+    test_class_no_inheritance();
+    test_class_field_default();
+    test_class_empty();
 }

mist-test/src/items/enum_test.mist

@@ -1,10 +1,9 @@
 pub module enum_test;
-pub module enum_test;
 
 enum OptionInt
 {
-    None,
-    Some(i32),
+    None;
+    Some(i32);
 }
 
 pub void test_enum_named()
@@ -35,8 +34,13 @@ pub void test_enum_tuple()
 
 enum Shape
 {
-    Circle {i32 radius},
-    Rect {i32 w, i32 h},
+    Circle {
+        i32 radius;
+    };
+    Rect {
+        i32 w;
+        i32 h;
+    };
 }
 
 pub void test_enum_struct()
@@ -68,9 +72,9 @@ pub void test_enum_struct()
 
 enum Color
 {
-    Red,
-    Green,
-    Blue,
+    Red;
+    Green;
+    Blue;
 }
 
 pub void test_enum_eq()
@@ -86,10 +90,40 @@ pub void test_enum_eq()
     }
 }
 
+enum Option<T>
+{
+    None;
+    Some(T);
+}
+
+pub void test_generic_enum()
+{
+    Option<i32> x = Option::Some(42);
+    match x {
+        Option::Some(v) => {
+            assert_eq!(v, 42);
+        }
+        _ => {
+            assert_eq!(0, 1);
+        }
+    }
+
+    Option<bool> y = Option::None;
+    match y {
+        Option::None => {
+            assert_eq!(1, 1);
+        }
+        _ => {
+            assert_eq!(0, 1);
+        }
+    }
+}
+
 pub void run_tests()
 {
     test_enum_named();
     test_enum_tuple();
     test_enum_struct();
     test_enum_eq();
+    test_generic_enum();
 }

mist-test/src/items/function_test.mist

@@ -1,5 +1,4 @@
 pub module function_test;
-pub module function_test;
 
 void greet()
 {
@@ -70,6 +69,17 @@ pub void test_recursive_fn()
     assert_eq!(factorial(5), 120);
 }
 
+T identity<T>(T x)
+{
+    x
+}
+
+pub void test_fn_generic()
+{
+    assert_eq!(identity(42), 42);
+    assert_eq!(identity("hello"), "hello");
+}
+
 pub void run_tests()
 {
     test_basic_function();
@@ -80,4 +90,5 @@ pub void run_tests()
     test_method_call();
     test_nested_fn_calls();
     test_recursive_fn();
+    test_fn_generic();
 }

mist-test/src/items/impl_test.mist

@@ -1,10 +1,9 @@
 pub module impl_test;
-pub module impl_test;
 
 struct Vector2
 {
-    i32 x,
-    i32 y,
+    i32 x;
+    i32 y;
 }
 
 impl Vector2
@@ -73,9 +72,29 @@ pub void test_multiple_impls()
     assert_eq!(c.y, 6);
 }
 
+struct Wrapper<T>
+{
+    T value;
+}
+
+impl<T: Copy> Wrapper<T>
+{
+    pub T get(&self)
+    {
+        self.value
+    }
+}
+
+pub void test_impl_generic()
+{
+    Wrapper<i32> w = Wrapper { value: 42 };
+    assert_eq!(w.get(), 42);
+}
+
 pub void run_tests()
 {
     test_inherent_impl();
     test_trait_impl_block();
     test_multiple_impls();
+    test_impl_generic();
 }

mist-test/src/items/struct_test.mist

@@ -1,10 +1,9 @@
 pub module struct_test;
-pub module struct_test;
 
 struct Point
 {
-    i32 x,
-    i32 y,
+    i32 x;
+    i32 y;
 }
 
 pub void test_struct_create_access()
@@ -40,8 +39,8 @@ pub void test_struct_destructure()
 
 struct Line
 {
-    Point start,
-    Point end,
+    Point start;
+    Point end;
 }
 
 pub void test_struct_nested()
@@ -60,10 +59,55 @@ pub void test_struct_nested()
     assert_eq!(l.end.y, 10);
 }
 
+struct Empty {}
+
+pub void test_empty_struct()
+{
+    let e = Empty {};
+}
+
+struct Pair<T>
+{
+    T first;
+    T second;
+}
+
+pub void test_generic_struct()
+{
+    Pair<i32> p = Pair<i32> { first: 1, second: 2 };
+    assert_eq!(p.first, 1);
+    assert_eq!(p.second, 2);
+}
+
+pub void test_struct_partial_destructure()
+{
+    let p = Point {
+        x: 10,
+        y: 20,
+    };
+    let Point {x, ..} = p;
+    assert_eq!(x, 10);
+}
+
+pub void test_struct_destructure_rename()
+{
+    let p = Point {
+        x: 5,
+        y: 15,
+    };
+    let Point {x: a, y: b} = p;
+    assert_eq!(a, 5);
+    assert_eq!(b, 15);
+}
+
 pub void run_tests()
 {
     test_struct_create_access();
     test_struct_mut_field();
     test_struct_destructure();
     test_struct_nested();
+    test_empty_struct();
+    test_generic_struct();
+    test_struct_partial_destructure();
+    test_struct_destructure_rename();
 }

mist-test/src/items/trait_test.mist

@@ -1,5 +1,4 @@
 pub module trait_test;
-pub module trait_test;
 
 trait Speak
 {
@@ -13,7 +12,7 @@ trait Greet : Speak
 
 struct Dog
 {
-    String name,
+    String name;
 }
 
 impl Speak for Dog