[Issue 9977] New: Function local templates should be allowed

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9977

           Summary: Function local templates should be allowed
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2013-04-22 01:35:50 PDT ---
Currently DMD accepts declaring template aggregates and functions inside
functions.

void test1()
{
    struct S1(T) { T value; }
    auto func1(T)(T value) { return value; }
    static assert(is(S1!int == struct));
    assert(func1(10) == 10);
}

But raw template declaration is not allowed.

void test2()
{
    template S2(T) { struct S2 { T value; } }    // line 10
    template func2(T) { auto func2(T value) { return value; } }    // line 11
    static assert(is(S2!int == struct));
    assert(func2(10) == 10);
}
Output:
test.d(10): Error: template definitions aren't allowed inside functions
test.d(11): Error: template definitions aren't allowed inside functions

Today, I think this is not reasonable limitation.

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