[Issue 4137] New: Undefined identifier error in is(typeof())

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4137

           Summary: Undefined identifier error in is(typeof())
           Product: D
           Version: unspecified
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2010-05-01 05:38:35 PDT ---
I don't know if there are ways to solve this problem, I hope this isn't another
situation like bug 3950.

This is wrong D2 code. The template Foo has the type parameter T while inside
it uses the parameter R:


template Foo(T) {
    enum bool Foo = is(typeof(R.length));
}
void main() {
    assert(Foo!(int[]));
}


The program compiles with no errors with dmd 2.043 and at run time produces:
core.exception.AssertError at test2(5): Assertion failure

But to help debugging, I'd like the compiler to point R as a undefined
identifier (even with the 'did you mean...') at compile-time. Is this possible?

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