[Issue 3041] New: Array slices can be compared to their element type: bad codegen or ICE

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3041

           Summary: Array slices can be compared to their element type:
                    bad codegen or ICE
           Product: D
           Version: 1.045
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid, ice-on-invalid-code, wrong-code
          Severity: major
          Priority: P3
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: matti.niemenmaa+dbugzilla at iki.fi


The following invalid code is accepted by DMD 1.045:

void main() {
    int[1] a = 1;
    int b = 1;
    assert (a[] == b);
}

The assertion fails, meaning that some nonsense code has been generated.
According to the spec the above is invalid: == isn't an array operation. Other
comparison operators like < and >= are also incorrectly accepted.

The following variation gives "Internal error: ../ztc/cgcod.c 1554":

void main() {
    int[] a = [1];
    int b = 1;
    assert (a[] == b);
}

If the slice is removed from the assertion, making it read just "a == b",
neither example compiles, as expected:

arst.d(4): Error: incompatible types for ((a) == (b)): 'int[1u]' and 'int'
arst.d(4): Error: incompatible types for ((a) == (b)): 'int[]' and 'int'

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