From c75cfb363fb8a827774892c76f3417efcf58cba0 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Sun, 23 Oct 2022 14:27:34 +0800
Subject: improve error message when using `toTask` with a call with a return
 value (#20622)

---
 lib/std/tasks.nim | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/std/tasks.nim b/lib/std/tasks.nim
index ac35e26bf..055ddf144 100644
--- a/lib/std/tasks.nim
+++ b/lib/std/tasks.nim
@@ -110,7 +110,8 @@ macro toTask*(e: typed{nkCall | nkInfix | nkPrefix | nkPostfix | nkCommand | nkC
     let b = toTask hello(13)
     assert b is Task
 
-  doAssert getTypeInst(e).typeKind == ntyVoid
+  if getTypeInst(e).typeKind != ntyVoid:
+    error("'toTask' cannot accept a call with a return value", e)
 
   when compileOption("threads"):
     if not isGcSafe(e[0]):
-- 
cgit 1.4.1-2-gfad0