2016-11-01 10:00:24 -05:00
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error[E0308]: mismatched types
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--> $DIR/coerce-suggestions.rs:17:20
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2018-02-22 18:42:32 -06:00
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LL | let x: usize = String::new();
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2016-11-01 10:00:24 -05:00
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| ^^^^^^^^^^^^^ expected usize, found struct `std::string::String`
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= note: expected type `usize`
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2017-01-11 15:55:41 -06:00
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found type `std::string::String`
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2016-11-01 10:00:24 -05:00
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error[E0308]: mismatched types
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2017-12-10 14:29:24 -06:00
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--> $DIR/coerce-suggestions.rs:19:19
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2016-11-01 10:00:24 -05:00
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2018-02-22 18:42:32 -06:00
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LL | let x: &str = String::new();
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2017-11-25 08:00:26 -06:00
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| ^^^^^^^^^^^^^
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| expected &str, found struct `std::string::String`
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| help: consider borrowing here: `&String::new()`
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2016-11-01 10:00:24 -05:00
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= note: expected type `&str`
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2017-01-11 15:55:41 -06:00
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found type `std::string::String`
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2016-11-01 10:00:24 -05:00
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error[E0308]: mismatched types
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2017-12-10 14:29:24 -06:00
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--> $DIR/coerce-suggestions.rs:22:10
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2016-11-01 10:00:24 -05:00
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2018-02-22 18:42:32 -06:00
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LL | test(&y);
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2016-11-01 10:00:24 -05:00
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| ^^ types differ in mutability
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= note: expected type `&mut std::string::String`
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2017-01-11 15:55:41 -06:00
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found type `&std::string::String`
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2016-11-01 10:00:24 -05:00
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error[E0308]: mismatched types
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2017-12-10 14:29:24 -06:00
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--> $DIR/coerce-suggestions.rs:24:11
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2016-11-01 10:00:24 -05:00
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2018-02-22 18:42:32 -06:00
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LL | test2(&y);
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2016-11-01 10:00:24 -05:00
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| ^^ types differ in mutability
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= note: expected type `&mut i32`
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2017-01-11 15:55:41 -06:00
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found type `&std::string::String`
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2016-11-01 10:00:24 -05:00
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error[E0308]: mismatched types
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2017-12-10 14:29:24 -06:00
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--> $DIR/coerce-suggestions.rs:27:9
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2016-11-01 10:00:24 -05:00
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2018-02-22 18:42:32 -06:00
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LL | f = box f;
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type error method suggestions use whitelisted identity-like conversions
Previously, on a type mismatch (and if this wasn't preëmpted by a
higher-priority suggestion), we would look for argumentless methods
returning the expected type, and list them in a `help` note.
This had two major shortcomings. Firstly, a lot of the suggestions didn't
really make sense (if you used a &str where a String was expected,
`.to_ascii_uppercase()` is probably not the solution you were hoping
for). Secondly, we weren't generating suggestions from the most useful
traits!
We address the first problem with an internal
`#[rustc_conversion_suggestion]` attribute meant to mark methods that keep
the "same value" in the relevant sense, just converting the type. We
address the second problem by making `FnCtxt.probe_for_return_type` pass
the `ProbeScope::AllTraits` to `probe_op`: this would seem to be safe
because grep reveals no other callers of `probe_for_return_type`.
Also, structured suggestions are preferred (because they're pretty, but
also for RLS and friends).
Also also, we make the E0055 autoderef recursion limit error use the
one-time-diagnostics set, because we can potentially hit the limit a lot
during probing. (Without this,
test/ui/did_you_mean/recursion_limit_deref.rs would report "aborting due to
51 errors").
Unfortunately, the trait probing is still not all one would hope for: at a
minimum, we don't know how to rule out `into()` in cases where it wouldn't
actually work, and we don't know how to rule in `.to_owned()` where it
would. Issues #46459 and #46460 have been filed and are ref'd in a FIXME.
This is hoped to resolve #42929, #44672, and #45777.
2017-11-19 13:25:35 -06:00
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| ^^^^^
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| cyclic type of infinite size
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| help: try using a conversion method: `box f.to_string()`
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2016-11-01 10:00:24 -05:00
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2017-06-01 01:48:19 -05:00
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error[E0308]: mismatched types
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2017-12-10 14:29:24 -06:00
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--> $DIR/coerce-suggestions.rs:31:9
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2017-06-01 01:48:19 -05:00
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2018-02-22 18:42:32 -06:00
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LL | s = format!("foo");
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2017-11-25 08:00:26 -06:00
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| ^^^^^^^^^^^^^^
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| expected mutable reference, found struct `std::string::String`
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| help: consider mutably borrowing here: `&mut format!("foo")`
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2017-06-01 01:48:19 -05:00
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= note: expected type `&mut std::string::String`
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found type `std::string::String`
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2017-11-21 13:48:35 -06:00
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= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
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2017-06-01 01:48:19 -05:00
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2017-07-02 05:49:30 -05:00
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error: aborting due to 6 previous errors
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2016-11-01 10:00:24 -05:00
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2018-02-19 14:40:25 -06:00
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If you want more information on this error, try using "rustc --explain E0308"
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