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If a symbol name can only be imported from one place for a type, and
as long as it was not glob-imported anywhere in the current crate, we
can trim its printed path and print only the name.
This has wide implications on error messages with types, for example,
shortening `std::vec::Vec` to just `Vec`, as long as there is no other
`Vec` importable anywhere.
This adds a new '-Z trim-diagnostic-paths=false' option to control this
feature.
On the good path, with no diagnosis printed, we should try to avoid
issuing this query, so we need to prevent trimmed_def_paths query on
several cases.
This change also relies on a previous commit that differentiates
between `Debug` and `Display` on various rustc types, where the latter
is trimmed and presented to the user and the former is not.
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Prior to this PR, when we aborted because a "critical pass" failed, we
displayed the number of errors from that critical pass. While that's the
number of errors that caused compilation to abort in *that place*,
that's not what people really want to know. Instead, always report the
total number of errors, and don't bother to track the number of errors
from the last pass that failed.
This changes the compiler driver API to handle errors more smoothly,
and therefore is a compiler-api-[breaking-change].
Fixes #42793.
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This reverts commit 5558c64f33446225739c1153b43d2e309bb4f50e.
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See #33525 for details.
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When a span starts on a line with nothing but whitespace to the left,
and there are no other annotations in that line, simplify the visual
representation of the span.
Go from:
```rust
error[E0072]: recursive type `A` has infinite size
--> file2.rs:1:1
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1 | struct A {
| _^ starting here...
2 | | a: A,
3 | | }
| |_^ ...ending here: recursive type has infinite size
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```
To:
```rust
error[E0072]: recursive type `A` has infinite size
--> file2.rs:1:1
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1 | / struct A {
2 | | a: A,
3 | | }
| |_^ recursive type has infinite size
```
Remove `starting here...`/`...ending here` labels from all multiline
diagnostics.
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```rust
error[E0046]: not all trait items implemented, missing: `Item`
--> $DIR/issue-23729.rs:20:9
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20 | impl Iterator for Recurrence {
| _________^ starting here...
21 | | //~^ ERROR E0046
22 | | //~| NOTE missing `Item` in implementation
23 | | //~| NOTE `Item` from trait: `type Item;`
... |
36 | | }
37 | | }
| |_________^ ...ending here: missing `Item` in implementation
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= note: `Item` from trait: `type Item;`
```
instead of
```rust
error[E0046]: not all trait items implemented, missing: `Item`
--> $DIR/issue-23729.rs:20:9
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20 | impl Iterator for Recurrence {
| ^ missing `Item` in implementation
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= note: `Item` from trait: `type Item;`
```
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Show `Trait` instead of `<Struct as Trait>` in E0323
For a given file
```
trait Foo {
fn bar(&self);
}
pub struct FooConstForMethod;
impl Foo for FooConstForMethod {
const bar: u64 = 1;
}
```
show
```
error[E0323]: item `bar` is an associated const, which doesn't match its trait `Foo`
```
instead of
```
error[E0323]: item `bar` is an associated const, which doesn't match its trait `<FooConstForMethod as Foo>`
```
Fix #37618
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For a given file
```
trait Foo {
fn bar(&self);
}
pub struct FooConstForMethod;
impl Foo for FooConstForMethod {
const bar: u64 = 1;
}
```
show
```
error[E0323]: item `bar` is an associated const, which doesn't match its trait `Foo`
```
instead of
```
error[E0323]: item `bar` is an associated const, which doesn't match its trait `<FooConstForMethod as Foo>`
```
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When dealing with multiline spans that span few lines, show the complete
span instead of restricting to the first character of the first line.
For example, instead of:
```
% ./rustc foo.rs
error[E0277]: the trait bound `{integer}: std::ops::Add<()>` is not satisfied
--> foo.rs:13:9
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13 | foo(1 + bar(x,
| ^ trait `{integer}: std::ops::Add<()>` not satisfied
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```
show
```
% ./rustc foo.rs
error[E0277]: the trait bound `{integer}: std::ops::Add<()>` is not satisfied
--> foo.rs:13:9
|
13 | foo(1 + bar(x,
| ________^ starting here...
14 | | y),
| |_____________^ ...ending here: trait `{integer}: std::ops::Add<()>` not satisfied
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```
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Provide either a span pointing to the original definition of missing
trait items, or a message with the inferred definitions.
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