Allow `macro_rules!` to also define item and stmt macros#4021

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paulstansifer wants to merge 17 commits intorust-lang:incomingfrom

paulstansifer:master

Commits on Nov 22, 2012

Allow `macro_rules!` macros to expand to expressions or items.
paulstansifer
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Grammaticalinate an error message.
paulstansifer
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Make it possible to invoke item macros without passing identifier arguments.
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Allow for macros to occur in statement position.
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Make it possible to expand stmt macros.
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Use `biased_match!` to avoid over-deep indentation in expand.rs.
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Allow the expansion of old-style expr macros in stmt position.
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No longer parse the delimiters of the RHS of a macro as part of the expansion.
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Allow parsing of macros in statement position.
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Make the parser handle stmt macros that might be exprs at the end of blocks.
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Distinguish `stmt_mac`s that are followed by semicolons and those that aren't.
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Forbid item macros from occuring where statement macros might occur, and allow item macros to look like statement/expr macros.
paulstansifer
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Update tests to respect the way that macros work now.
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Respect semicolons always when expanding statments.
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Forbid attrs on macros, since we don't handle them properly yet.
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Test statement macros.
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Macros can now also be stmts and items.
paulstansifer
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