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give a better error message for some template expansions (#19871)

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Andreas Rumpf 2022-06-09 14:21:18 +02:00 • committed by GitHub
commit 25d89269eb
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1 changed files with 4 additions and 2 deletions
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compiler/semstmts.nim
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@ -140,7 +140,9 @@ proc discardCheck(c: PContext, result: PNode, flags: TExprFlags) =
n[0] = result
elif result.typ.kind != tyError and c.config.cmd != cmdInteractive:
var n = result
while n.kind in skipForDiscardable: n = n.lastSon
while n.kind in skipForDiscardable:
if n.kind == nkTryStmt: n = n[0]
else: n = n.lastSon
var s = "expression '" & $n & "' is of type '" &
result.typ.typeToString & "' and has to be used (or discarded)"
if result.info.line != n.info.line or