[Issue 9080] New: DMD compile ambiguous code or doesn’t even warn

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9080

           Summary: DMD compile ambiguous code or doesn’t even warn
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dimitri.sabadie at gmail.com


--- Comment #0 from Dimitri Sabadie <dimitri.sabadie at gmail.com> 2012-11-25 10:45:10 PST ---
Description:
Here’s a little snippet D code:

import std.stdio : writefln;

abstract class A {
    int a;
}

class B : A {
    this(int a) {
        a = a;
    }
}

int main() {
    auto b = new B(314);

    writefln("value: %d", b.a);
    return 0;
}

Compiling it with:
    dmd -debug -w -wi auto_aff.d

DMD fails to figure out the auto-affectation. The fact that it either:
1. compiles and has an obviously but hard to find incorrect behavior ;
2. compiles and segfault if `a' is a class or struct for instance.

If we go with in int a, DMD figures it out. So, I think a warning should be
appreciated for that behavior.

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