Bug 12322 – Bad error message with wrong Nullable array argument

import std.typecons: Nullable; alias Foo = int[5]; alias NFoo = Nullable!Foo; NFoo bar1() { int[] a; return NFoo(a); // Error } NFoo bar2() { immutable int[] b; return NFoo(b); // Error } void main() {} dmd 2.066alpha gives error messages that I think could be better: test.d(6,16): Error: inout method std.typecons.Nullable!(int[5]).Nullable.this is not callable using a mutable object test.d(10,16): Error: inout method std.typecons.Nullable!(int[5]).Nullable.this is not callable using a mutable object

See also Issue 12323

*** Issue 13016 has been marked as a duplicate of this issue. ***

The error message is now: test.d(6): Error: constructor `std.typecons.Nullable!(int[5]).Nullable.this(inout(int[5]) value) inout` is not callable using argument types `(int[])` test.d(6): cannot pass argument `a` of type `int[]` to parameter `inout(int[5]) value` test.d(10): Error: constructor `std.typecons.Nullable!(int[5]).Nullable.this(inout(int[5]) value) inout` is not callable using argument types `(immutable(int[]))` test.d(10): cannot pass argument `b` of type `immutable(int)[]` to parameter `inout(int[5]) value`