auto merge of #15233 : jbclements/rust/match-var-hygiene-etc, r=cmr
This PR includes two big things and a bunch of little ones. 1) It enables hygiene for variables bound by 'match' expressions. 2) It fixes a bug discovered indirectly (#15221), wherein fold traversal failed to visit nonterminal nodes. 3) It fixes a small bug in the macro tutorial. It also adds tests for the first two, and makes a bunch of small comment improvements and cleanup.
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src/test/run-pass/issue-15221.rs
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