[Issue 6696] New: Error messages for const/immutable arrays given to immutable/const

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6696

           Summary: Error messages for const/immutable arrays given to
                    immutable/const
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2011-09-19 14:52:47 PDT ---
A wrong D2 program:

void foo(immutable ref int[5] a) {}
void bar(const ref int[5] a) {}
void main() {
    const int[5] arr1;
    foo(arr1); // line 5
    immutable int[5] arr2;
    bar(arr2); // line 7
}


DMD 2.055 prints:

test.d(5): Error: function test.foo (ref immutable immutable(int[5u]) a) is not
callable using argument types (const(int[5u]))
test.d(5): Error: cast(immutable(int[5u]))arr1 is not an lvalue
test.d(7): Error: cast(const(int[5u]))arr2 is not an lvalue

The first error message is almost good, but why does it print "immutable
immutable"?

I think the second error message is useless.

In line 7 the bar(arr2) call gives just a "arr2 is not an lvalue" that I think
is not good enough.


So for this program I think a better error message printout is something like:

test.d(5): Error: function test.foo(ref immutable(int[5]) a) is not callable
using argument types (const(int[5])).
test.d(7): Error: function test.foo(ref const(int[5]) a) is not callable using
argument types (immutable(int[5])).

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