bors 023fd7e74a Auto merge of #52767 - ljedrz:avoid_format, r=petrochenkov ...

Prefer to_string() to format!()

Simple benchmarks suggest in some cases it can be faster by even 37%:
```
test converting_f64_long  ... bench:         339 ns/iter (+/- 199)
test converting_f64_short ... bench:         136 ns/iter (+/- 34)
test converting_i32_long  ... bench:          87 ns/iter (+/- 16)
test converting_i32_short ... bench:          87 ns/iter (+/- 49)
test converting_str       ... bench:          54 ns/iter (+/- 15)
test formatting_f64_long  ... bench:         349 ns/iter (+/- 176)
test formatting_f64_short ... bench:         145 ns/iter (+/- 14)
test formatting_i32_long  ... bench:          98 ns/iter (+/- 14)
test formatting_i32_short ... bench:          93 ns/iter (+/- 15)
test formatting_str       ... bench:          86 ns/iter (+/- 23)
```

2018-07-29 09:33:37 +00:00

..

Cargo.toml

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chalk_context.rs

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dropck_outlives.rs

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evaluate_obligation.rs

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implied_outlives_bounds.rs

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lib.rs

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lowering.rs

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normalize_erasing_regions.rs

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normalize_projection_ty.rs

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type_op.rs

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