make any_pat! and u64_from_be_bytes_bench_impl! macros hygienic
added test for method arg hygiene
hygiene for method args
new_mark -> apply_mark, new_rename -> apply_rename
add test case for closure hygiene: ExprFnBlock and ExprProc
common abstraction for renaming
implement hygiene for ExprFnBlock and ExprProc
DONT LET THIS COMMIT GO UPSTREAM