Small update

src/parser/grammar.pest

@@ -1,10 +1,11 @@
 WHITESPACE = _{ " " | "\t" | "\r" | "\n" }
 COMMENT    = _{ "//" ~ (!"\n" ~ ANY)* }
 
-program = { SOI ~ (import_decl | function_decl | struct_decl | class_decl)* ~ EOI }
+program =  { SOI ~ item* ~ EOI }
+item    = _{ import_decl | function_decl | struct_decl | class_decl }
 
 // primitives
-identifier = @{ ASCII_ALPHA ~ (ASCII_ALPHANUMERIC | "_")* }
+identifier = @{ (ASCII_ALPHA | "_") ~ (ASCII_ALPHANUMERIC | "_")* }
 integer    = @{ ASCII_DIGIT+ }
 float      = @{ ASCII_DIGIT+ ~ "." ~ ASCII_DIGIT+ }
 boolean    =  { "true" | "false" }
@@ -12,9 +13,11 @@ string_lit =  { "\"" ~ inner_str ~ "\"" }
 inner_str  = @{ (!"\"" ~ ANY)* }
 
 // top level
-import_decl   = { "import" ~ string_lit }
-struct_decl   = { "struct" ~ identifier ~ "{" ~ struct_field* ~ "}" }
-class_decl    = { "class" ~ identifier ~ "{" ~ (struct_field | function_decl)* ~ "}" }
+import_decl  =  { "import" ~ string_lit }
+struct_decl  =  { "struct" ~ identifier ~ "{" ~ struct_field* ~ "}" }
+class_decl   =  { "class" ~ identifier ~ "{" ~ class_member* ~ "}" }
+class_member = _{ struct_field | function_decl }
+
 function_decl = { "fn" ~ identifier ~ "(" ~ param_list? ~ ")" ~ ("->" ~ type_expr)? ~ block }
 
 struct_field = { identifier ~ ":" ~ type_expr }
@@ -23,7 +26,14 @@ param        = { identifier ~ ":" ~ type_expr }
 
 // statements
 block     =  { "{" ~ statement* ~ "}" }
-statement = _{ let_stmt | return_stmt | if_stmt | for_stmt | assign_stmt | expression }
+statement = _{
+    let_stmt
+  | return_stmt
+  | if_stmt
+  | for_stmt
+  | assign_stmt
+  | expression
+}
 
 assign_stmt = { identifier ~ "=" ~ expression }
 let_stmt    = { "let" ~ identifier ~ (":" ~ type_expr)? ~ "=" ~ expression }
@@ -31,29 +41,49 @@ return_stmt = { "return" ~ expression? }
 if_stmt     = { "if" ~ expression ~ block ~ ("else" ~ block)? }
 for_stmt    = { "for" ~ identifier ~ "in" ~ expression ~ block }
 
-// types — optional is a suffix, not a recursive wrapper
+// types
 type_expr  =  { base_type ~ "?"? }
 base_type  = _{ array_type | identifier }
 array_type =  { "[" ~ type_expr ~ "]" }
 
-// expressions
-expression =  { term ~ (bin_op ~ term)* }
-bin_op     = _{ add | sub | mul | div | eq | neq | lte | gte | lt | gt | and | or }
-add        =  { "+" }
-sub        =  { "-" }
-mul        =  { "*" }
-div        =  { "/" }
-eq         =  { "==" }
-neq        =  { "!=" }
-lte        =  { "<=" }
-gte        =  { ">=" }
-lt         =  { "<" }
-gt         =  { ">" }
-and        =  { "&&" }
-or         =  { "||" }
+// expressions (still simple, no precedence yet)
+expression = { term ~ (bin_op ~ term)* }
 
+bin_op = _{
+    eq
+  | neq
+  | lte
+  | gte
+  | lt
+  | gt
+  | and
+  | or
+  | add
+  | sub
+  | mul
+  | div
+}
+
+add = { "+" }
+sub = { "-" }
+mul = { "*" }
+div = { "/" }
+eq  = { "==" }
+neq = { "!=" }
+lte = { "<=" }
+gte = { ">=" }
+lt  = { "<" }
+gt  = { ">" }
+and = { "&&" }
+or  = { "||" }
+
+// literals
 struct_literal = {
-    identifier ~ "{" ~ (struct_init_field ~ ("," ~ struct_init_field)*)? ~ "}"
+    identifier ~ "{" ~ struct_init_list? ~ "}"
+}
+
+struct_init_list = {
+    struct_init_field ~ ("," ~ struct_init_field)* ~ ","?
 }
 
 struct_init_field = {
@@ -61,12 +91,29 @@ struct_init_field = {
 }
 
 array_literal = {
-    "[" ~ (expression ~ ("," ~ expression)*)? ~ "]"
+    "[" ~ (expression ~ ("," ~ expression)*)? ~ ","? ~ "]"
 }
 
-term         =  { primary ~ (field_access | call_suffix)* }
-field_access =  { "." ~ identifier }
-call_suffix  =  { "(" ~ (expression ~ ("," ~ expression)*)? ~ ")" }
-primary      = _{ struct_literal | array_literal | float | integer | string_lit | boolean | self_kw | null_kw | identifier }
-self_kw      =  { "self" }
-null_kw      =  { "null" }
+// expressions continuation
+term = { primary ~ (field_access | call_suffix)* }
+
+field_access = { "." ~ identifier }
+
+call_suffix = {
+    "(" ~ (expression ~ ("," ~ expression)*)? ~ ","? ~ ")"
+}
+
+primary = _{
+    struct_literal
+  | array_literal
+  | float
+  | integer
+  | string_lit
+  | boolean
+  | self_kw
+  | null_kw
+  | identifier
+}
+
+self_kw = { "self" }
+null_kw = { "null" }