• via Digitalmars-d-bugs (55/55) Apr 26 2014 https://issues.dlang.org/show_bug.cgi?id=12659

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=12659

          Issue ID: 12659
           Summary: Named mixin templates conflict
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: timon.gehr gmx.ch

With DMD 2.065, the following code fails to compile:

import std.stdio;

mixin template Foo(T){
    T foo(T a){ return a; }
}
mixin Foo!int g;
mixin Foo!string g;

void main(){
    writeln(foo(2));
    writeln(foo("a"));
    writeln(g.foo(2));
    writeln(g.foo("a"));
}

Error: mixin tt.Foo!(string) conflicts with mixin tt.Foo!(int) at tt.d(6)

Similarly if two named mixins occur in different files:

module b;
mixin template Foo(T){
    T foo(T a){ return a; }
}
mixin Foo!string g;

// ---

module c;
mixin template Foo(T){
    T foo(T a){ return a; }
}
mixin Foo!int g;

// ---

import std.stdio;
import b,c;

void main(){
    writeln(foo(2));
    writeln(foo("a"));
    writeln(g.foo(2));
    writeln(g.foo("a"));
}

Error: b.Foo!(string) at b.d(5) conflicts with c.Foo!(int) at c.d(5)
Error: function b.Foo!(string).foo (string a) is not callable using argument
types (int)
Error: cannot implicitly convert expression (2) of type int to string
Error: b.Foo!(string) at b.d(5) conflicts with c.Foo!(int) at c.d(5)

Both examples should compile.

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