[Issue 4497] inexpressive error message for const object method

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4497


Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |schveiguy at yahoo.com


--- Comment #2 from Steven Schveighoffer <schveiguy at yahoo.com> 2010-07-26 06:20:03 PDT ---
I think the message is actually accurate.  I'll split out the relevant parts:

testbug.d(11): Error: function

testbug.Foo.getX ()          is not callable using argument types 
                 () const

What's happening is, the hidden this parameter is passed as const since the
object is const, but getX doesn't accept a const Foo.

It's the same as if you had a function like this:

void foo(Foo x)

foo(f);

Since f is const, and foo(Foo) must accept a mutable foo.

However, most people see the "const" applying to the function, which is a
common misconception.

I think a better error message might look like this:

Error: function constobj.Foo.getX () cannot be called using a const Foo.

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