rollup merge of #20482: kmcallister/macro-reform
rollup merge of #20482: kmcallister/macro-reform

Conflicts:
	src/libflate/lib.rs
	src/libstd/lib.rs
	src/libstd/macros.rs
	src/libsyntax/feature_gate.rs
	src/libsyntax/parse/parser.rs
	src/libsyntax/show_span.rs
	src/test/auxiliary/macro_crate_test.rs
	src/test/compile-fail/lint-stability.rs
	src/test/run-pass/intrinsics-math.rs
	src/test/run-pass/tcp-connect-timeouts.rs

rust-lang/rust.vim