checker: fix goto label with comptime tmpl (#12853)

vlib/v/checker/comptime.v

@@ -30,6 +30,7 @@ fn (mut c Checker) comptime_call(mut node ast.ComptimeCall) ast.Type {
 	}
 	if node.is_vweb {
 		// TODO assoc parser bug
+		save_cur_fn := c.table.cur_fn
 		pref_ := *c.pref
 		pref2 := &pref.Preferences{
 			...pref_
@@ -56,6 +57,8 @@ fn (mut c Checker) comptime_call(mut node ast.ComptimeCall) ast.Type {
 		c.nr_warnings += c2.nr_warnings
 		c.nr_errors += c2.nr_errors
 		c.nr_notices += c2.nr_notices
+
+		c.table.cur_fn = save_cur_fn
 	}
 	if node.method_name == 'html' {
 		rtyp := c.table.find_type_idx('vweb.Result')

vlib/v/tests/goto_test.v

@@ -36,3 +36,19 @@ pub fn test_goto_after_return() {
 	finally_ok:
 	assert true
 }
+
+fn test_goto_with_comptime_tmpl() {
+	a := 22
+	_ := $tmpl('./tmpl/a.txt')
+	println('before goto')
+
+	unsafe {
+		goto label
+	}
+	println('failed goto')
+	assert false
+
+	label:
+	println('goto label')
+	assert true
+}