found simpler fix

parser/v2/goexpression/parse.go

@@ -140,7 +140,7 @@ func Expression(src string) (start, end int, err error) {
 	errorHandler := func(pos token.Position, msg string) {
 		err = fmt.Errorf("error parsing expression: %v", msg)
 	}
-	s.Init(file, []byte(src), errorHandler, scanner.ScanComments)
+	s.Init(file, []byte(src), errorHandler, 0)
 
 	// Read chains of identifiers and constants up until RBRACE, e.g.:
 	// true
@@ -176,6 +176,7 @@ loop:
 			braceDepth--
 			if braceDepth < 0 {
 				// We've hit the end of the expression.
+			    end = int(pos)-1
 				break loop
 			}
 			end = int(pos)
@@ -185,12 +186,13 @@ loop:
 			continue
 		case token.ILLEGAL:
 			return 0, 0, fmt.Errorf("illegal token: %v", lit)
-        case token.COMMENT:
-            end = int(pos) + len(lit) - 1
 		default:
 			end = int(pos) + len(tok.String()) - 1
 		}
+        fmt.Println("pos: ", int(pos))
 	}
+    fmt.Println("OUT")
+    fmt.Println(src[start:end])
 	return start, end, nil
 }