Fix bug in matching struct patterns
#8350
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Document possible use with -S option.
Added testcases for `match` keyword including test for issue #5625.
Code that collects fields in struct-like patterns used to ignore
wildcard patterns like `Foo{_}`. But `enter_defaults` considered
struct-like patterns as default in order to overcome this
(accoring to my understanding of situation).
However such behaviour caused code like this:
```
enum E {
Foo{f: int},
Bar
}
let e = Bar;
match e {
Foo{f: _f} => { /* do something (1) */ }
_ => { /* do something (2) */ }
}
```
consider pattern `Foo{f: _f}` as default. That caused inproper behaviour
and even segfaults while trying to destruct `Bar` as `Foo{f: _f}`.
Issues: #5625 , #5530.
This patch fixes `collect_record_or_struct_fields` to split cases of
single wildcard struct-like pattern and no struct-like pattern at all.
Former case resolved with `enter_rec_or_struct` (and not with
`enter_defaults`).
Closes #5625.
Closes #5530.
bors
added a commit
that referenced
this pull request
Aug 9, 2013
Code that collects fields in struct-like patterns used to ignore
wildcard patterns like `Foo{_}`. But `enter_defaults` considered
struct-like patterns as default in order to overcome this
(accoring to my understanding of situation).
However such behaviour caused code like this:
```
enum E {
Foo{f: int},
Bar
}
let e = Bar;
match e {
Foo{f: _f} => { /* do something (1) */ }
_ => { /* do something (2) */ }
}
```
consider pattern `Foo{f: _f}` as default. That caused inproper behaviour
and even segfaults while trying to destruct `Bar` as `Foo{f: _f}`.
Issues: #5625 , #5530.
This patch fixes `collect_record_or_struct_fields` to split cases of
single wildcard struct-like pattern and no struct-like pattern at all.
Former case resolved with `enter_rec_or_struct` (and not with
`enter_defaults`).
Closes #5625.
Closes #5530.
flip1995
pushed a commit
to flip1995/rust
that referenced
this pull request
Jan 27, 2022
fix bad suggestion on `numeric_literal` closes rust-lang#8331 changelog: [`numeric_literal`] fix suggestion not showing sign
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Code that collects fields in struct-like patterns used to ignore
wildcard patterns like
Foo{_}. Butenter_defaultsconsideredstruct-like patterns as default in order to overcome this
(accoring to my understanding of situation).
However such behaviour caused code like this:
consider pattern
Foo{f: _f}as default. That caused inproper behaviourand even segfaults while trying to destruct
BarasFoo{f: _f}.Issues: #5625 , #5530.
This patch fixes
collect_record_or_struct_fieldsto split cases ofsingle wildcard struct-like pattern and no struct-like pattern at all.
Former case resolved with
enter_rec_or_struct(and not withenter_defaults).Closes #5625.
Closes #5530.