[Issue 4843] New: Inconsistency in overloading ref vs. non-ref

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4843

           Summary: Inconsistency in overloading ref vs. non-ref
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2010-09-09 06:03:33 PDT ---
The following code compiles and correctly resolves the lvalue vs. non-lvalue
overloading:

import std.stdio;

void doStuff(const ref int i) {
    writeln("Doing stuff by ref.");
}

void doStuff(const int i) {
    writeln("Forwarding to ref overload.");
    doStuff(i);
}

void main() {
    doStuff(1);
} 

Similar code also works for classes and arrays.  It seems to be broken for
structs, though.  The following code is rejected:

import std.stdio;

struct S {}

bool fun(const ref S rhs) {
    return true;
}

bool fun(const S rhs) {
    return fun(rhs);
}

test9.d(12): Error: function test9.fun called with argument types:
    ((const(S)))
matches both:
    test9.fun(ref const const(S) rhs)
and:
    test9.fun(const const(S) rhs)

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