[Issue 5539] New: Statically disallow unsigned<0 test

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5539

           Summary: Statically disallow unsigned<0 test
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-02-07 12:21:53 PST ---
This is a reduced case (Loss of error flag) for a more common bug:


import core.stdc.stdio: printf;
int foo(bool cant_be_true) {
    int error = cant_be_true ? -1 : 1;
    return error;
}
void main() {
    uint x = foo(true);
    if (x < 0)
        printf("error!");
}


Gerally I suggest to add to the D front-end a test to statically disallow this
kind of test:

unsigned < 0

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