libsyntax: note that `let a = (let b = something)` is invalid#30765

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dsprenkels wants to merge 4 commits intorust-lang:masterfrom

dsprenkels:unexpected-let-keyword

Commits on Jan 7, 2016

libsyntax: note that `let a = (let b = something)` is invalid
dsprenkels
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libsyntax: move check for keyword Let to a more logical spot
dsprenkels
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Commits on Jan 14, 2016

Update qquote.rs test case and make unexpected `let` error fatal
dsprenkels
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Commits on Jan 15, 2016

do not additionally note about unexpected identifier after unexpected let
dsprenkels
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