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Sometimes the parser attempts to synthesize spans from within a macro
context with the span for the captured argument, leading to non-sensical
spans with very bad output. Given that an incorrect span is worse than
a partially incomplete span, when detecting this situation return only
one of the spans without mergin them.
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Point at unused arguments for format string
Avoid overlapping spans by only pointing at the arguments that are not
being used in the argument string. Enable libsyntax to have diagnostics
with multiple primary spans by accepting `Into<MultiSpan>` instead of
`Span`.
Partially addresses #41850.
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Avoid overlapping spans by only pointing at the arguments that are not
being used in the argument string. Enable libsyntax to have diagnostics
with multiple primary spans by accepting `Into<MultiSpan>` instead of
`Span`.
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When we suggest the replacement for a macro we include the "!" in the
suggested replacement but the span only contains the name of the macro
itself. Using that replacement would cause a duplicate "!" in the
resulting code.
I originally tried to extend the span to be replaced by 1 byte in
rust-lang/rust#47424. However, @zackmdavis pointed out that there can be
whitespace between the macro name and the bang.
Instead, just remove the bang from the suggested replacement.
Fixes #47418
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Make positional argument error in format! clearer
r? @estebank
Fixes #44954
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Point at path segment on module not found
Point at the correct path segment on a import statement where a module
doesn't exist.
New output:
```rust
error[E0432]: unresolved import `std::bar`
--> <anon>:1:10
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1 | use std::bar::{foo1, foo2};
| ^^^ Could not find `bar` in `std`
```
instead of:
```rust
error[E0432]: unresolved import `std::bar::foo1`
--> <anon>:1:16
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1 | use std::bar::{foo1, foo2};
| ^^^^ Could not find `bar` in `std`
error[E0432]: unresolved import `std::bar::foo2`
--> <anon>:1:22
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1 | use std::bar::{foo1, foo2};
| ^^^^ Could not find `bar` in `std`
```
Fix #43040.
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Point at the correct path segment on a import statement where a module
doesn't exist.
New output:
```rust
error[E0432]: unresolved import `std::bar`
--> <anon>:1:10
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1 | use std::bar::{foo1, foo2};
| ^^^ Could not find `bar` in `std`
```
instead of:
```rust
error[E0432]: unresolved import `std::bar::foo1`
--> <anon>:1:16
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1 | use std::bar::{foo1, foo2};
| ^^^^ Could not find `bar` in `std`
error[E0432]: unresolved import `std::bar::foo2`
--> <anon>:1:22
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1 | use std::bar::{foo1, foo2};
| ^^^^ Could not find `bar` in `std`
```
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Resolves #42945
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This reverts commit 5558c64f33446225739c1153b43d2e309bb4f50e.
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New error codes
Part of #42229.
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trace_macro: Show both the macro call and its expansion. #42072.
See #42072 for the initial motivation behind this.
The change is not the minimal fix, but I want this behavior almost every time I use `trace_macros`.
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See #33525 for details.
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Previously, `assert_eq!(left, right,)` (respectively, `assert_ne!(left,
right,)`; note the trailing comma) would result in a confusing "requires
at least a format string argument" error. In reality, a format string is
optional, but the trailing comma puts us into the "match a token tree of
zero or more tokens" branch of the macro (in order to support the
optional format string), and passing the empty token tree into
`format_args!` results in the confusing error. If instead we match a
token tree of one or more tokens, we get a much more sensible
"unexpected end of macro invocation" error.
While we're here, fix up a stray space before a comma in the match
guards.
Resolves #39369.
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This teaches `format_args!` how to interpret format printf- and
shell-style format directives. This is used in cases where there are
unused formatting arguments, and the reason for that *might* be because
the programmer is trying to use the wrong kind of formatting string.
This was prompted by an issue encountered by simulacrum on the #rust IRC
channel. In short: although `println!` told them that they weren't using
all of the conversion arguments, the problem was in using printf-syle
directives rather than ones `println!` would undertand.
Where possible, `format_args!` will tell the programmer what they should
use instead. For example, it will suggest replacing `%05d` with `{:0>5}`,
or `%2$.*3$s` with `{1:.3$}`. Even if it cannot suggest a replacement,
it will explicitly note that Rust does not support that style of directive,
and direct the user to the `std::fmt` documentation.
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- Fixes #36164
- Part of #35233
- handles unknown fields
- uses UI-style tests
- update all related tests (cfail, ui, incremental)
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