mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 12:33:57 +00:00
796be88062
When suggesting a type on inference error, do not use `{closure@..}`.
Instead, replace with an appropriate `fn` ptr.
On the error message, use `short_ty_string` and write long types to
disk.
```
error[E0284]: type annotations needed for `Select<{closure@lib.rs:2782:13}, _, Expression<'_>, _>`
--> crates/lang/src/parser.rs:41:13
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41 | let lit = select! {
| ^^^
42 | Token::Int(i) = e => Expression::new(Expr::Lit(ast::Lit::Int(i.parse().unwrap())), e.span()),
| ---- type must be known at this point
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= note: the full type name has been written to '/home/gh-estebank/iowo/target/debug/deps/lang-e2d6e25819442273.long-type-4587393693885174369.txt'
= note: cannot satisfy `<_ as chumsky::input::Input<'_>>::Span == SimpleSpan`
help: consider giving `lit` an explicit type, where the type for type parameter `I` is specified
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41 | let lit: Select<for<'a, 'b> fn(tokens::Token<'_>, &'a mut MapExtra<'_, 'b, _, _>) -> Option<Expression<'_>>, _, Expression<'_>, _> = select! {
| +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```
instead of
```
error[E0284]: type annotations needed for `Select<{closure@/home/gh-estebank/.cargo/registry/src/index.crates.io-6f17d22bba15001f/chumsky-1.0.0-alpha.6/src/lib.rs:2782:13: 2782:28}, _, Expression<'_>, _>`
--> crates/lang/src/parser.rs:41:13
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41 | let lit = select! {
| ^^^
42 | Token::Int(i) = e => Expression::new(Expr::Lit(ast::Lit::Int(i.parse().unwrap())), e.span()),
| ---- type must be known at this point
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= note: cannot satisfy `<_ as chumsky::input::Input<'_>>::Span == SimpleSpan`
help: consider giving `lit` an explicit type, where the type for type parameter `I` is specified
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41 | let lit: Select<{closure@/home/gh-estebank/.cargo/registry/src/index.crates.io-6f17d22bba15001f/chumsky-1.0.0-alpha.6/src/lib.rs:2782:13: 2782:28}, _, Expression<'_>, _> = select! {
| ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
```
Fix #123630.
97 lines
3.5 KiB
Plaintext
97 lines
3.5 KiB
Plaintext
error[E0283]: type annotations needed
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--> $DIR/issue-77982.rs:9:10
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LL | opts.get(opt.as_ref());
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| ^^^ ------------ type must be known at this point
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| |
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| cannot infer type of the type parameter `Q` declared on the method `get`
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= note: multiple `impl`s satisfying `String: Borrow<_>` found in the following crates: `alloc`, `core`:
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- impl Borrow<str> for String;
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- impl<T> Borrow<T> for T
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where T: ?Sized;
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note: required by a bound in `HashMap::<K, V, S>::get`
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--> $SRC_DIR/std/src/collections/hash/map.rs:LL:COL
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help: consider specifying the generic argument
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LL | opts.get::<Q>(opt.as_ref());
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| +++++
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error[E0283]: type annotations needed
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--> $DIR/issue-77982.rs:9:10
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LL | opts.get(opt.as_ref());
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| ^^^ ------ type must be known at this point
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| |
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| cannot infer type of the type parameter `Q` declared on the method `get`
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= note: multiple `impl`s satisfying `String: AsRef<_>` found in the following crates: `alloc`, `std`:
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- impl AsRef<OsStr> for String;
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- impl AsRef<Path> for String;
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- impl AsRef<[u8]> for String;
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- impl AsRef<str> for String;
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help: consider specifying the generic argument
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LL | opts.get::<Q>(opt.as_ref());
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| +++++
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error[E0283]: type annotations needed
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--> $DIR/issue-77982.rs:14:59
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LL | let ips: Vec<_> = (0..100_000).map(|_| u32::from(0u32.into())).collect();
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| --- ^^^^
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| |
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| type must be known at this point
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= note: multiple `impl`s satisfying `u32: From<_>` found in the `core` crate:
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- impl From<Char> for u32;
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- impl From<Ipv4Addr> for u32;
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- impl From<bool> for u32;
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- impl From<char> for u32;
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- impl From<u16> for u32;
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- impl From<u8> for u32;
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help: try using a fully qualified path to specify the expected types
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LL | let ips: Vec<_> = (0..100_000).map(|_| u32::from(<u32 as Into<T>>::into(0u32))).collect();
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| +++++++++++++++++++++++ ~
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error[E0283]: type annotations needed for `Box<_>`
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--> $DIR/issue-77982.rs:37:9
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LL | let _ = ().foo();
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| ^ --- type must be known at this point
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note: multiple `impl`s satisfying `(): Foo<'_, _>` found
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--> $DIR/issue-77982.rs:30:1
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LL | impl Foo<'static, u32> for () {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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LL | impl<'a> Foo<'a, i16> for () {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: consider giving this pattern a type, where the type for type parameter `T` is specified
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LL | let _: Box<T> = ().foo();
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| ++++++++
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error[E0283]: type annotations needed for `Box<_>`
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--> $DIR/issue-77982.rs:41:9
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LL | let _ = (&()).bar();
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| ^ --- type must be known at this point
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note: multiple `impl`s satisfying `&(): Bar<'_, _>` found
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--> $DIR/issue-77982.rs:33:1
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LL | impl<'a> Bar<'static, u32> for &'a () {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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LL | impl<'a> Bar<'a, i16> for &'a () {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: consider giving this pattern a type, where the type for type parameter `T` is specified
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LL | let _: Box<T> = (&()).bar();
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| ++++++++
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error: aborting due to 5 previous errors
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For more information about this error, try `rustc --explain E0283`.
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