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pretty-pretty extremal constants!

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While many programmers may intuitively appreciate the significance of
"magic numbers" like −2147483648, Rust is about empowering everyone to
build reliable and efficient software! It's a bit more legible to
print the constant names (even noisy fully-qualified-paths thereof).

The bit-manipulation methods mirror those in
`librustc_mir::hair::pattern::_match::all_constructors`; thanks to the
immortal Varkor for guidance.

Resolves #56393.
This commit is contained in:
Zack M. Davis 2019-07-06 19:41:12 -07:00
parent c326c2e0f1
commit d1cdb02e4d
12 changed files with 62 additions and 45 deletions
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4
src/test/ui/refutable-pattern-errors.stderr
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@ -4,11 +4,11 @@ error[E0005]: refutable pattern in function argument: `(_, _)` not covered
LL | fn func((1, (Some(1), 2..=3)): (isize, (Option<isize>, isize))) { }
| ^^^^^^^^^^^^^^^^^^^^^ pattern `(_, _)` not covered
error[E0005]: refutable pattern in local binding: `(-2147483648i32..=0i32, _)` not covered
error[E0005]: refutable pattern in local binding: `(std::i32::MIN..=0i32, _)` not covered
--> $DIR/refutable-pattern-errors.rs:5:9
|
LL | let (1, (Some(1), 2..=3)) = (1, (None, 2));
| ^^^^^^^^^^^^^^^^^^^^^ pattern `(-2147483648i32..=0i32, _)` not covered
| ^^^^^^^^^^^^^^^^^^^^^ pattern `(std::i32::MIN..=0i32, _)` not covered
error: aborting due to 2 previous errors