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Auto merge of #91359 - dtolnay:args, r=Mark-Simulacrum

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Emit simpler code from format_args

I made this PR so that `cargo expand` dumps a less overwhelming amount of formatting-related code.

<br>

`println!("rust")` **Before:**

```rust
{
    ::std::io::_print(::core::fmt::Arguments::new_v1(&["rust\n"],
                                                     &match () {
                                                          _args => [],
                                                      }));
};
```

**After:**

```rust
{ ::std::io::_print(::core::fmt::Arguments::new_v1(&["rust\n"], &[])); };
```

`println!("{}", x)` **Before:**

```rust
{
    ::std::io::_print(::core::fmt::Arguments::new_v1(
        &["", "\n"],
        &match (&x,) {
            _args => [::core::fmt::ArgumentV1::new(
                _args.0,
                ::core::fmt::Display::fmt,
            )],
        },
    ));
};
```

**After:**

```rust
{
    ::std::io::_print(::core::fmt::Arguments::new_v1(
        &["", "\n"],
        &[::core::fmt::ArgumentV1::new(&x, ::core::fmt::Display::fmt)],
    ));
};
```
This commit is contained in:
bors 2022-01-21 06:20:18 +00:00
commit ec00cf80a3
1 changed files with 10 additions and 1 deletions
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11
tests/ui/to_string_in_display.stderr
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@ -6,5 +6,14 @@ LL | write!(f, "{}", self.to_string())
|
= note: `-D clippy::to-string-in-display` implied by `-D warnings`
error: aborting due to previous error
error: unnecessary use of `to_string`
--> $DIR/to_string_in_display.rs:55:50
|
LL | Self::E(string) => write!(f, "E {}", string.to_string()),
| ^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::unnecessary-to-owned` implied by `-D warnings`
= note: this error originates in the macro `$crate::format_args` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 2 previous errors