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more intuitive behaviour for 'discardable' in expression bodies

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Araq 2013-05-04 18:58:58 +02:00
commit f8af7ed6b4
6 changed files with 99 additions and 22 deletions
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7
compiler/semexprs.nim
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@ -1146,10 +1146,9 @@ proc semProcBody(c: PContext, n: PNode): PNode =
# ``result``:
if result.kind == nkSym and result.sym == c.p.resultSym:
nil
elif result.kind == nkNilLit or ImplicitlyDiscardable(result):
# intended semantic: if it's 'discardable' and the context allows for it,
# discard it. This is bad for chaining but nicer for C wrappers.
# ambiguous :-(
elif result.kind == nkNilLit:
# or ImplicitlyDiscardable(result):
# new semantic: 'result = x' triggers the void context
result.typ = nil
elif result.kind == nkStmtListExpr and result.typ.kind == tyNil:
# to keep backwards compatibility bodies like: