Bug 24529 – is expression ignores implicit conversion of enum when pattern matching

As of DMD 2.108.0, the following program fails to compile: --- struct S(T) {} enum E : S!int { a = S!int() } static assert(is(E : S!int)); // ok static assert(is(E : S!T, T)); // error --- The error message is: --- bug.d(5): Error: static assert: `is(E : S!T, __isexp_id2, T)` is false --- The expected behavior is for both static assert statements to pass. See also issue 21975, in which the same error was caused by a struct with `alias this`.

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