From 793bc8c58580dfb64d7c31ca992c34b38e9847e7 Mon Sep 17 00:00:00 2001
From: Ginger Bill <bill@gingerbill.org>
Date: Mon, 25 Sep 2017 23:08:22 +0100
Subject: [PATCH] Fix issue #89

---
 src/check_expr.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/check_expr.cpp b/src/check_expr.cpp
index 9357ebc61..bec444d2f 100644
--- a/src/check_expr.cpp
+++ b/src/check_expr.cpp
@@ -87,7 +87,12 @@ void error_operand_not_expression(Operand *o) {
 void error_operand_no_value(Operand *o) {
 	if (o->mode == Addressing_NoValue) {
 		gbString err = expr_to_string(o->expr);
-		error(o->expr, "`%s` used as value", err);
+		AstNode *x = unparen_expr(o->expr);
+		if (x->kind == AstNode_CallExpr) {
+			error(o->expr, "`%s` call does not return a value and cannot be used as a value", err);
+		} else {
+			error(o->expr, "`%s` used as a value", err);
+		}
 		gb_string_free(err);
 		o->mode = Addressing_Invalid;
 	}