http://d.puremagic.com/issues/show_bug.cgi?id=5877
Summary: Cannot 'alias __traits(parent, obj) X;'
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: rejects-valid
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: kenn...@gmail.com
--- Comment #0 from kenn...@gmail.com 2011-04-23 23:13:49 PDT ---
Since the introduction of __traits(parent) in commit 2e261cd6, it is possible
that the __traits expression returns a type. However, the parser does not
recognize this in an alias statement, and rejects the code.
--------------------------------------------------------
class B {
int x();
alias __traits(parent, x) S;
static assert(is(B == S));
}
--------------------------------------------------------
x.d(3): basic type expected, not __traits
x.d(3): no identifier for declarator int
x.d(3): semicolon expected to close alias declaration
x.d(3): Declaration expected, not '__traits'
--------------------------------------------------------
A workaround is to create an existing expression that returns a type:
--------------------------------------------------------
class B {
int x();
alias typeof(__traits(parent, x).init) S;
static assert(is(B == S));
}
--------------------------------------------------------
But it is better the __traits work without these hacks.
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