From: Corey Farwell <coreyf@rwell.org>
Date: Thu, 2 Mar 2017 19:53:44 +0000 (-0500)
Subject: Rollup merge of #40117 - SimonSapin:to-err-is-for-the-formatter, r=alexcrichton
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=0536fd6396133189fb4a41377d3972cd312078a0;p=rust.git

Rollup merge of #40117 - SimonSapin:to-err-is-for-the-formatter, r=alexcrichton

Panic on errors in `format!` or `<T: Display>::to_string`

… instead of silently ignoring a result.

`fmt::Write for String` never returns `Err`, so implementations of `Display` (or other traits of that family) never should either.

Fixes #40103
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0536fd6396133189fb4a41377d3972cd312078a0