[Issue 6235] New: Regression(DMD 2.053) ICE on typeof(Range.init[0..$]) inside a templated struct/class

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6235

           Summary: Regression(DMD 2.053) ICE on typeof(Range.init[0..$])
                    inside a templated struct/class
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: ice-on-valid-code
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: sandford at jhu.edu


--- Comment #0 from Rob Jacques <sandford at jhu.edu> 2011-07-01 13:51:56 PDT ---
This is a regression between DMD 2.052 and DMD 2.053. Here is a very reduced
test case:

struct Bug(Range) { pragma(msg, typeof(Range.init[0..$]) ); }

void main(string[] args) {
    Bug!(ubyte[]) bug;
}

The issue also effect classes and is statements, i.e.

    enum useSlicing = is(typeof(Range.init[0..$]) : const ubyte[] );

This problem seems to be limited to the use of a template parameter inside a
struct/class defined outside of the current scope. All of the following
compile:

void main(string[] args) {
    pragma(msg, typeof((ubyte[]).init[0..$]) );

    alias ubyte[] Range;
    pragma(msg, typeof(Range.init[0..$]) );

    struct NotBug(Range2) { pragma(msg, typeof(Range2.init[0..$]) ); }
    NotBug!(ubyte[]) notBug; 
}     

This bug can be worked around by placing the statement inside its own
sub-template. I.e:

struct Bug(Range) {
    template UseSlicing(__Range) {
        enum UseSlicing = is(typeof(__Range.init[0..$]) : const ubyte[] );
    }
    pragma(msg, UseSlicing!Range);
}

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