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`for_each_child` exists for this exact pattern.
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Introduce `'ra` lifetime name.
`rustc_resolve` allocates many things in `ResolverArenas`. The lifetime used for references into the arena is mostly `'a`, and sometimes `'b`.
This commit changes it to `'rslv`, which is much more descriptive. The commit also changes the order of lifetimes on a couple of structs so that '`rslv` is second last, before `'tcx`, and does other minor renamings such as `'r` to `'a`.
r? ``@petrochenkov``
cc ``@oli-obk``
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Simplify some nested `if` statements
Applies some but not all instances of `clippy::collapsible_if`. Some ended up looking worse afterwards, though, so I left those out. Also applies instances of `clippy::collapsible_else_if`
Review with whitespace disabled please.
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`rustc_resolve` allocates many things in `ResolverArenas`. The lifetime
used for references into the arena is mostly `'a`, and sometimes `'b`.
This commit changes it to `'ra`, which is much more descriptive. The
commit also changes the order of lifetimes on a couple of structs so
that '`ra` is second last, before `'tcx`, and does other minor
renamings such as `'r` to `'a`.
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When encountering a name in an import that could have come from a crate that wasn't imported, use a structured suggestion to suggest `extern crate foo;` pointing at the right place in the crate.
When encountering `_` in an import, do not suggest `extern crate _;`.
```
error[E0432]: unresolved import `spam`
--> $DIR/import-from-missing-star-3.rs:2:9
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LL | use spam::*;
| ^^^^ maybe a missing crate `spam`?
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help: consider importing the `spam` crate
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LL + extern crate spam;
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```
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The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.
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Add a label to point to the lacking macro name definition
Fixes https://github.com/rust-lang/rust/issues/126694, but adopts the suggestion from https://github.com/rust-lang/rust/issues/118295
```
--> src/main.rs:1:14
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1 | macro_rules! {
| ^ put a macro name here
```
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We don't want to have questions in the diagnostic output. Instead, we use wording that communicates uncertainty, like "might":
```
error[E0432]: unresolved import `spam`
--> $DIR/import-from-missing-star-3.rs:2:9
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LL | use spam::*;
| ^^^^ you might be missing crate `spam`
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= help: consider adding `extern crate spam` to use the `spam` crate
```
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Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing). Inlining format args prevents accidental `&` misuse.
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When finding item gated behind a `cfg` flag, point at it
Previously we would only mention that the item was gated out, and opportunisitically mention the feature flag name when possible. We now point to the place where the item was gated, which can be behind layers of macro indirection, or in different modules.
```
error[E0433]: failed to resolve: could not find `doesnt_exist` in `inner`
--> $DIR/diagnostics-cross-crate.rs:18:23
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LL | cfged_out::inner::doesnt_exist::hello();
| ^^^^^^^^^^^^ could not find `doesnt_exist` in `inner`
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note: found an item that was configured out
--> $DIR/auxiliary/cfged_out.rs:6:13
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LL | pub mod doesnt_exist {
| ^^^^^^^^^^^^
note: the item is gated here
--> $DIR/auxiliary/cfged_out.rs:5:5
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LL | #[cfg(FALSE)]
| ^^^^^^^^^^^^^
```
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When suggesting to rename an import with `as`, use a smaller span to
render the suggestion with a better format:
```
error[E0252]: the name `baz` is defined multiple times
--> $DIR/issue-25396.rs:4:5
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LL | use foo::baz;
| -------- previous import of the module `baz` here
LL | use bar::baz;
| ^^^^^^^^ `baz` reimported here
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= note: `baz` must be defined only once in the type namespace of this module
help: you can use `as` to change the binding name of the import
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LL | use bar::baz as other_baz;
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```
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Fix import suggestion ice
Fixes #127302
#127302 only crash in edition 2015
#120074 can only reproduced in edition 2021
so I added revisions in test file.
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Previously we would only mention that the item was gated out, and opportunisitically mention the feature flag name when possible. We now point to the place where the item was gated, which can be behind layers of macro indirection, or in different modules.
```
error[E0433]: failed to resolve: could not find `doesnt_exist` in `inner`
--> $DIR/diagnostics-cross-crate.rs:18:23
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LL | cfged_out::inner::doesnt_exist::hello();
| ^^^^^^^^^^^^ could not find `doesnt_exist` in `inner`
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note: found an item that was configured out
--> $DIR/auxiliary/cfged_out.rs:6:13
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LL | pub mod doesnt_exist {
| ^^^^^^^^^^^^
note: the item is gated here
--> $DIR/auxiliary/cfged_out.rs:5:5
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LL | #[cfg(FALSE)]
| ^^^^^^^^^^^^^
```
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on local fields
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This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle
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When both `std::` and `core::` items are available, only suggest the
`std::` ones. We ensure that in `no_std` crates we suggest `core::`
items.
Ensure that the list of items suggested to be imported are always in the
order of local crate items, `std`/`core` items and finally foreign crate
items.
Tweak wording of import suggestion: if there are multiple items but they
are all of the same kind, we use the kind name and not the generic "items".
Fix #83564.
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Translation of the lint message happens when the actual diagnostic is
created, not when the lint is buffered. Generating the message from
BuiltinLintDiag ensures that all required data to construct the message
is preserved in the LintBuffer, eventually allowing the messages to be
moved to fluent.
Remove the `msg` field from BufferedEarlyLint, it is either generated
from the data in the BuiltinLintDiag or stored inside
BuiltinLintDiag::Normal.
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Some minor (English only) heroics are performed to print error messages
like "5th rule of macro `m` is never used". The form "rule #5 of macro
`m` is never used" is just as good and much simpler to implement.
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Explicit imports are more standard nowadays and easier to read.
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Not the dropping of the trailing `s` -- this type describes a single
diagnostic and its name should be singular.
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r=matthiaskrgr
Suggest moving definition if non-found macro_rules! is defined later
Fixes #121061
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Improve renaming suggestion when item starts with underscore
Fixes https://github.com/rust-lang/rust/issues/121776.
It goes from:
```terminal
error[E0433]: failed to resolve: use of undeclared type `Foo`
--> src/foo.rs:6:13
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6 | let _ = Foo::Bar;
| ^^^ use of undeclared type `Foo`
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help: an enum with a similar name exists, consider changing it
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1 | enum Foo {
| ~~~
```
to:
```terminal
error[E0433]: failed to resolve: use of undeclared type `Foo`
--> foo.rs:6:13
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6 | let _ = Foo::Bar;
| ^^^ use of undeclared type `Foo`
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help: an enum with a similar name exists, consider renaming `_Foo` into `Foo`
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1 | enum Foo {
| ~~~
error: aborting due to 1 previous error
```
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obvious what is actually suggested
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Diagnostic renaming
Renaming various diagnostic types from `Diagnostic*` to `Diag*`. Part of https://github.com/rust-lang/compiler-team/issues/722. There are more to do but this is enough for one PR.
r? `@davidtwco`
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Fix issues in suggesting importing extern crate paths
Fixes #121168
r? ``@petrochenkov``
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