parser: fix panic for struct Abc { pub mut: } (fix #24404) (#24403)

spytheman · web-flow · commit 2bd2d00caf90 · 2025-05-04T12:38:58.000+03:00
diff --git a/vlib/v/parser/struct.v b/vlib/v/parser/struct.v
@@ -213,7 +213,9 @@ fn (mut p Parser) struct_decl(is_anon bool) ast.StructDecl {
 			mut option_pos := token.Pos{}
 
 			if p.tok.kind == .rcbr {
-				ast_fields.last().next_comments << pre_field_comments
+				if ast_fields.len > 0 {
+					ast_fields.last().next_comments << pre_field_comments
+				}
 				break
 			}
 
diff --git a/vlib/v/parser/tests/struct_with_empty_pub_mut_section.out b/vlib/v/parser/tests/struct_with_empty_pub_mut_section.out
diff --git a/vlib/v/parser/tests/struct_with_empty_pub_mut_section.vv b/vlib/v/parser/tests/struct_with_empty_pub_mut_section.vv
@@ -0,0 +1,2 @@
+pub struct Foo {
+}

Original file line number	Diff line number	Diff line change
`@@ -213,7 +213,9 @@ fn (mut p Parser) struct_decl(is_anon bool) ast.StructDecl {`
`213`	`213`	`mut option_pos := token.Pos{}`
`214`	`214`
`215`	`215`	`if p.tok.kind == .rcbr {`
`216`		`- ast_fields.last().next_comments << pre_field_comments`
	`216`	`+ if ast_fields.len > 0 {`
	`217`	`+ ast_fields.last().next_comments << pre_field_comments`
	`218`	`+ }`
`217`	`219`	`break`
`218`	`220`	`}`
`219`	`221`