parser: allow type as field type on params struct construction (fix #…

…23091) (#23098)

vlib/v/parser/fn.v

@@ -141,7 +141,7 @@ fn (mut p Parser) call_args() []ast.CallArg {
 			array_decompose = true
 		}
 		mut expr := ast.empty_expr
-		if p.tok.kind == .name && p.peek_tok.kind == .colon {
+		if p.tok.kind in [.name, .key_type] && p.peek_tok.kind == .colon {
 			// `foo(key:val, key2:val2)`
 			expr = p.struct_init('void_type', .short_syntax, false)
 		} else {

vlib/v/tests/keyword_as_params_field_test.v

@@ -0,0 +1,24 @@
+@[params]
+struct FooParams {
+	type FooType = .first
+}
+
+enum FooType {
+	first
+	second
+}
+
+fn foo(params FooParams) string {
+	match params.type {
+		.first {
+			return 'First'
+		}
+		.second {
+			return 'Second'
+		}
+	}
+}
+
+fn test_main() {
+	assert foo(type: .second) == 'Second'
+}