diff --git a/crates/codegen/src/expr.rs b/crates/codegen/src/expr.rs
index 50641a9..8cdbaca 100644
--- a/crates/codegen/src/expr.rs
+++ b/crates/codegen/src/expr.rs
@@ -200,8 +200,10 @@ impl GenRust for Postfix {
 
                 for (name, expr) in fields {
                     cg.add(&name.get_rust());
-                    cg.add(": ");
-                    expr.gen_rust(ctx, cg);
+                    if let Some(expr) = expr {
+                        cg.add(": ");
+                        expr.gen_rust(ctx, cg);
+                    }
                     cg.add(",");
                 }
 
diff --git a/crates/parser/src/ast/expr.rs b/crates/parser/src/ast/expr.rs
index 13365c3..969cf21 100644
--- a/crates/parser/src/ast/expr.rs
+++ b/crates/parser/src/ast/expr.rs
@@ -56,7 +56,7 @@ pub enum Postfix {
         inner: String,
         delimiter: MacroDelimiter,
     },
-    StructCall(Vec<(Identifier, Expression)>),
+    StructCall(Vec<(Identifier, Option<Expression>)>),
     Assign(String, Box<Expression>),
     Index(Expression),
     As(TypeExpr),
diff --git a/crates/parser/src/grammar.pest b/crates/parser/src/grammar.pest
index 4a45207..cf4df27 100644
--- a/crates/parser/src/grammar.pest
+++ b/crates/parser/src/grammar.pest
@@ -523,7 +523,7 @@ macro_call_bracket = { "!" ~ "[" ~ macro_inner_v* ~ "]" }
 macro_call_brace   = { "!" ~ "{" ~ macro_inner_v* ~ "}" }
 
 struct_field_decl = {
-    identifier ~ ":" ~ expr
+    identifier ~ (":" ~ expr)?
 }
 
 struct_px = {
diff --git a/crates/parser/src/parser/common/expr.rs b/crates/parser/src/parser/common/expr.rs
index 12f076f..b3236d8 100644
--- a/crates/parser/src/parser/common/expr.rs
+++ b/crates/parser/src/parser/common/expr.rs
@@ -155,7 +155,7 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Postfix {
                 let mut pi = p.into_inner();
                 Ok((
                     Identifier::try_from(pi.next().unwrap())?,
-                    Expression::try_from(pi.next().unwrap()).get()?,
+                    pi.next().map(Expression::try_from).transpose().get()?,
                 ))
             }))),