[Issue 20092] void[1] auto slicing makes the compiler hang

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20092

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
The loop happens in 

  dmd.optimize.Expression.Expression_optimize(Expression e, int result, bool
keepLvalue)

But the background problem is that template parameter type deduction gives
`ubyte ` instead of `void`. As a consequence the protections against infinite
recursion when the optimizer visit a CastExpression don't work.

For example by rewriting the call in the test case this way

  (void[1]).init.front!void;

that works but

  (void[1]).init.front!ubyte;

loops...

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