checker: fix enums in builtin (#10366)

vlib/v/checker/checker.v

@@ -6588,16 +6588,15 @@ pub fn (mut c Checker) index_expr(mut node ast.IndexExpr) ast.Type {
 pub fn (mut c Checker) enum_val(mut node ast.EnumVal) ast.Type {
 	mut typ_idx := if node.enum_name == '' {
 		c.expected_type.idx()
-	} else { //
+	} else {
 		c.table.find_type_idx(node.enum_name)
 	}
-	// println('checker: enum_val: $node.enum_name typeidx=$typ_idx')
 	if typ_idx == 0 {
 		// Handle `builtin` enums like `ChanState`, so that `x := ChanState.closed` works.
 		// In the checker the name for such enums was set to `main.ChanState` instead of
 		// just `ChanState`.
-		if node.enum_name.starts_with('main.') {
-			typ_idx = c.table.find_type_idx(node.enum_name['.main'.len..])
+		if node.enum_name.starts_with('${c.mod}.') {
+			typ_idx = c.table.find_type_idx(node.enum_name['${c.mod}.'.len..])
 			if typ_idx == 0 {
 				c.error('unknown enum `$node.enum_name` (type_idx=0)', node.pos)
 				return ast.void_type
@@ -6615,7 +6614,6 @@ pub fn (mut c Checker) enum_val(mut node ast.EnumVal) ast.Type {
 		return ast.void_type
 	}
 	mut typ_sym := c.table.get_type_symbol(typ)
-	// println('tname=$typ_sym.name $node.pos.line_nr $c.file.path')
 	if typ_sym.kind == .array && node.enum_name.len == 0 {
 		array_info := typ_sym.info as ast.Array
 		typ = array_info.elem_type
@@ -6633,10 +6631,7 @@ pub fn (mut c Checker) enum_val(mut node ast.EnumVal) ast.Type {
 	if !(typ_sym.is_public || typ_sym.mod == c.mod) {
 		c.error('enum `$typ_sym.name` is private', node.pos)
 	}
-	// info := typ_sym.info as ast.Enum
 	info := typ_sym.enum_info()
-	// rintln('checker: x = $info.x enum val $c.expected_type $typ_sym.name')
-	// println(info.vals)
 	if node.val !in info.vals {
 		suggestion := util.new_suggestion(node.val, info.vals)
 		c.error(suggestion.say('enum `$typ_sym.name` does not have a value `$node.val`'),

vlib/v/tests/projects_that_should_compile_test.v

@@ -0,0 +1,25 @@
+import os
+
+fn testsuite_begin() {
+	os.setenv('VCOLORS', 'never', true)
+}
+
+fn vroot_path(relpath string) string {
+	return os.real_path(os.join_path(@VMODROOT, relpath))
+}
+
+fn vrun_ok(options string, path string) string {
+	cmd := '${@VEXE} $options $path'
+	res := os.execute(cmd)
+	if res.exit_code != 0 {
+		eprintln('> failing vrun cmd: $cmd')
+		eprintln('> output:\n$res.output')
+		assert res.exit_code == 0
+	}
+	return res.output
+}
+
+fn test_projects_should_run() {
+	res := vrun_ok('run', vroot_path('vlib/v/tests/testdata/enum_in_builtin') + os.path_separator)
+	assert res.trim_space() == 'v0'
+}

vlib/v/tests/testdata/enum_in_builtin/builtin.v

@@ -0,0 +1,18 @@
+module builtin
+
+pub enum BTest_enum {
+	v0 = 0
+	v1
+	v2
+	v3
+	v_t
+}
+
+pub fn (x BTest_enum) tst_f() string {
+	match x {
+		.v0 { return 'v0' }
+		.v1 { return 'v1' }
+		.v2 { return 'v2' }
+		else { return 'v_t' }
+	}
+}

vlib/v/tests/testdata/enum_in_builtin/c.v

@@ -0,0 +1,6 @@
+module c
+
+pub fn tst_enum() {
+	a := BTest_enum.v0
+	println(a.tst_f())
+}

vlib/v/tests/testdata/enum_in_builtin/main.v

@@ -0,0 +1,5 @@
+import c
+
+fn main() {
+	c.tst_enum()
+}