From d18580bb689f09f3f2d8e33f946d3b508d6a9a6e Mon Sep 17 00:00:00 2001
From: Mark Spanbroek <mark@spanbroek.net>
Date: Thu, 6 May 2021 17:28:58 +0200
Subject: [PATCH] Better error message when adding a void result to a .? chain

---
 questionable/chaining.nim | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/questionable/chaining.nim b/questionable/chaining.nim
index 7c8ca14..3373a0d 100644
--- a/questionable/chaining.nim
+++ b/questionable/chaining.nim
@@ -9,6 +9,8 @@ func expectSym(node: NimNode) =
 
 template `.?`*(option: typed, identifier: untyped{nkIdent}): untyped =
   # chain is of shape: option.?identifier
+  when not compiles(typeof(option.unsafeGet.identifier)):
+    {.error: ".? chain cannot return void".}
   option ->? option.unsafeGet.identifier
 
 macro `.?`*(option: typed, infix: untyped{nkInfix}): untyped =