node: elide parentheses in some cases

node.go

@@ -598,7 +598,7 @@ func (this *conversionState) convertNoFreeFloating(n_ node.Node) (string, error)
 				return "", parseErr{n, err}
 			}
 
-			args = append(args, exprGo)
+			args = append(args, removeParens(exprGo))
 		}
 
 		this.importPackages["fmt"] = struct{}{}
@@ -1182,6 +1182,16 @@ func constructorName(className string) string {
 	return `New` + className
 }
 
+// removeParens removes surrounding parentheses from an expression.
+// This is only safe in cases where there is ambiguously a single rvalue wanted,
+// e.g. between ( and , in a function call argument
+func removeParens(expr string) string {
+	for len(expr) > 2 && expr[0] == '(' && expr[len(expr)-1] == ')' {
+		expr = expr[1 : len(expr)-1]
+	}
+	return expr
+}
+
 // resolveName turns a `*name.Name` node into a Go string.
 func (this *conversionState) resolveName(n node.Node) (string, error) {
 	// TODO support namespace lookups
@@ -1346,7 +1356,7 @@ func (this *conversionState) convertFuncCallArgsCommon(args *node.ArgumentList)
 			rvalue = "..." + rvalue
 		}
 
-		callParams = append(callParams, rvalue)
+		callParams = append(callParams, removeParens(rvalue))
 	}
 
 	return "(" + strings.Join(callParams, `, `) + ")", nil // expr only, no semicolon/newline