[Issue 24788] New: Template inferrence bug?

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=24788

          Issue ID: 24788
           Summary: Template inferrence bug?
           Product: D
           Version: D2
          Hardware: All
               URL: http://dlang.org/
                OS: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: dmd
          Assignee: nob...@puremagic.com
          Reporter: turkey...@gmail.com

void f(T)(const(T)[] x, const(T)* y) {}
void test()
{
    // this works; T is inferred as int
    int[] x;
    const int y;
    f(x, &y);

    // fails: expected that T is inferred as int*
    int*[] a;
    const int* b;
    f(a, &b);
}


Something about a/b being an arrangement of int* compared to x/y with int
causes this to fail.
I reckon the non-uniformity of this type deduction logic is a bug.

This non-uniformity has caused me several problems with meta code.

I think it's banging into an issue with const promotion; if you remove const
from y and b, both cases work properly.

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