[Issue 4097] New: Error: can only declare type aliases within static if conditionals

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4097

           Summary: Error: can only declare type aliases within static if
                    conditionals
           Product: D
           Version: future
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: nfxjfg at gmail.com


--- Comment #0 from nfxjfg at gmail.com 2010-04-16 09:03:52 PDT ---
Look at this code:

----------------
void foo() { }
alias typeof(&foo) T;

// works
static if (is(T X : X*) && is(X == function)) {} else { static assert(false); }

// doesn't work
// Error: can only declare type aliases within static if conditionals
static assert(is(T X : X*) && is(X == function));
----------------

This looks really silly. Couldn't that restriction be lifted? The alias would
be only valid within the expression and wouldn't require a static if.

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