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This PR has the following effects:
extern $litis now legal where$lit:literaland$litis substituted for a string literal.extern "abi_that_does_not_exist"is now syntactically legal whereas before, the set of ABI strings was hard-coded into the grammar of the language. With this PR, the set of ABIs are instead validated and translated during lowering. That seems more appropriate.ast::FloatTyis now distinct fromrustc_target::abi::FloatTy. The former is used substantially more and the translation between them is only necessary in a single place.As a result of 2-3, libsyntax no longer depends on librustc_target, which should improve pipe-lining somewhat.
cc @rust-lang/lang -- the points 1-2 slightly change the definition of the language but in a way which seems consistent with our general principles (in particular wrt. the discussions of turning things into semantic errors). I expect this to be uncontroversial but it's worth letting y'all know. :)
r? @varkor