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Fix #13093 C++ Atomics: operator= is implicitly deleted because the default definition would be ill-formed (#21169)

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* add test

* fix #17982 Invalid C++ code generation when returning discardable var T

* fix #13093

* cpp atomic good example

* clearify the condition
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Bung 2023-01-27 00:50:44 -08:00 • committed by GitHub
commit a7bae919ad
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5 changed files with 54 additions and 2 deletions
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6
compiler/semstmts.nim
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@ -717,7 +717,11 @@ proc semVarOrLet(c: PContext, n: PNode, symkind: TSymKind): PNode =
tyUserTypeClassInst})
if actualType.kind in {tyObject, tyDistinct} and
actualType.requiresInit:
defaultConstructionError(c, v.typ, v.info)
# imported type use requiresInit pragma prevent implicit initialization
if (tfRequiresInit in actualType.flags and sfImportc in actualType.sym.flags):
discard
else:
defaultConstructionError(c, v.typ, v.info)
else:
checkNilable(c, v)
# allow let to not be initialised if imported from C: