Allow use of [_ ; n] syntax for fixed length and repeating arrays.
#20057
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This does NOT break any existing programs because the `[_, ..n]` syntax is also supported.
alexcrichton
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This does NOT break any existing programs because the `[_, ..n]` syntax is also supported. Part of rust-lang#19999 r? @nikomatsakis
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This does NOT break any existing programs because the
[_, ..n]syntax is also supported.Part of #19999
r? @nikomatsakis