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Introduce explicit copy (#15330)

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cooldome 2020-09-16 16:26:45 +01:00 • committed by GitHub
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3 changed files with 28 additions and 1 deletions
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compiler/injectdestructors.nim
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@ -408,7 +408,7 @@ proc passCopyToSink(n: PNode; c: var Con; s: var Scope): PNode =
if isLValue(n) and not isCapturedVar(n) and n.typ.skipTypes(abstractInst).kind != tyRef and c.inSpawn == 0:
message(c.graph.config, n.info, hintPerformance,
("passing '$1' to a sink parameter introduces an implicit copy; " &
"if possible, rearrange your program's control flow to prevent it") % $n)
"if possible, rearrange your program's control flow to prevent it or use 'copy($1)' to hint the compiler it is intentional") % $n)
else:
if c.graph.config.selectedGC in {gcArc, gcOrc}:
assert(not containsGarbageCollectedRef(n.typ))