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Friendlier error message with solution (#19880)

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* Add helpful suggestion, should always apply

* mention var param limitation in async docs

* Update compiler/lambdalifting.nim

whoops thanks

Co-authored-by: flywind <43030857+xflywind@users.noreply.github.com>

Co-authored-by: flywind <43030857+xflywind@users.noreply.github.com>
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Carlo Capocasa 2022-06-11 18:23:31 +02:00 • committed by GitHub
commit e2e663a143
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2 changed files with 7 additions and 1 deletions
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compiler/lambdalifting.nim
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@ -288,7 +288,8 @@ proc markAsClosure(g: ModuleGraph; owner: PSym; n: PNode) =
if illegalCapture(s):
localError(g.config, n.info,
("'$1' is of type <$2> which cannot be captured as it would violate memory" &
" safety, declared here: $3; using '-d:nimNoLentIterators' helps in some cases") %
" safety, declared here: $3; using '-d:nimNoLentIterators' helps in some cases." &
" Consider using a <ref $2> which can be captured.") %
[s.name.s, typeToString(s.typ), g.config$s.info])
elif not (owner.typ.callConv == ccClosure or owner.typ.callConv == ccNimCall and tfExplicitCallConv notin owner.typ.flags):
localError(g.config, n.info, "illegal capture '$1' because '$2' has the calling convention: <$3>" %