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implemented optional pragma for implicit discard

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This commit is contained in:
Araq 2011-09-24 13:55:24 +02:00
commit 72ceda98cb
11 changed files with 53 additions and 21 deletions
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6
compiler/semexprs.nim
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@ -548,11 +548,14 @@ proc buildEchoStmt(c: PContext, n: PNode): PNode =
addSon(result, semExpr(c, arg))
proc semExprNoType(c: PContext, n: PNode): PNode =
proc ImplicitelyDiscardable(n: PNode): bool {.inline.} =
result = isCallExpr(n) and n.sons[0].kind == nkSym and
sfOptional in n.sons[0].sym.flags
result = semExpr(c, n)
if result.typ != nil and result.typ.kind != tyStmt:
if gCmd == cmdInteractive:
result = buildEchoStmt(c, result)
else:
elif not ImplicitelyDiscardable(result):
localError(n.info, errDiscardValue)
proc isTypeExpr(n: PNode): bool =
@ -1196,7 +1199,6 @@ proc semExpr(c: PContext, n: PNode, flags: TExprFlags = {}): PNode =
of skMacro: result = semMacroExpr(c, n, s)
of skTemplate: result = semTemplateExpr(c, n, s)
of skType:
if n.kind != nkCall: GlobalError(n.info, errXisNotCallable, s.name.s)
# XXX think about this more (``set`` procs)
if n.len == 2:
result = semConv(c, n, s)