Simplify PatIdent to contain an Ident rather than a Path #15327
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@alexcrichton nooooo! Sigh. What I meant to say was: yes, that's obviously the right solution. Lemme go fix that.... :) . |
Rationale: for what appear to be historical reasons only, the PatIdent contains a Path rather than an Ident. This means that there are many places in the code where an ident is artificially promoted to a path, and---much more problematically--- a bunch of elements from a path are simply thrown away, which seems like an invitation to some really nasty bugs. This commit replaces the Path in a PatIdent with a SpannedIdent, which just contains an ident and a span.
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Jul 3, 2014
Closes #15276 (Guide: if) Closes #15280 (std::os - Add join_paths, make setenv non-utf8 capable) Closes #15314 (Guide: functions) Closes #15327 (Simplify PatIdent to contain an Ident rather than a Path) Closes #15340 (Guide: add mutable binding section) Closes #15342 (Fix ICE with nested macro_rules!-style macros) Closes #15350 (Remove duplicated slash in install script path) Closes #15351 (correct a few spelling mistakes in the tutorial) Closes #15352 (librustc: Have the kind checker check sub-bounds in trait casts.) Closes #15359 (Fix spelling errors.) Closes #15361 (Rename set_broadast() to set_broadcast().) Closes #15366 (Simplify creating a parser from a token tree) Closes #15367 (Add examples for StrVector methods) Closes #15372 (Vec::grow should use reserve_additional, Vec::reserve should check against capacity) Closes #15373 (Fix minor issues in the documentation of libtime.)
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Rationale: for what appear to be historical reasons only, the PatIdent contains
a Path rather than an Ident. This means that there are many places in the code
where an ident is artificially promoted to a path, and---much more problematically---
a bunch of elements from a path are simply thrown away, which seems like an invitation
to some really nasty bugs.
This commit replaces the Path in a PatIdent with a Path1, which just contains an ident
and a span.
Bonus! this patch should make the compiler use slightly less memory and be slightly faster, and
represents a net removal of about 100 lines of code from the repo.