rust/tests/rustdoc-ui/output-format-html-stable.rs

// compile-flags: --output-format html
// check-pass
// This tests that `--output-format html` is accepted without `-Z unstable-options`,
// since it has been stable since 1.0.
Fix handling of `--output-format json` flag - Don't treat it as deprecated on stable and beta channels. Before, it would give confusing and incorrect output: ``` warning: the 'output-format' flag is considered deprecated \| = warning: see issue #44136 <https://github.com/rust-lang/rust/issues/44136> for more information error: json output format isn't supported for doc generation ``` Both of those are wrong: output-format isn't deprecated, and json output is supported. - Require -Z unstable-options for `--output-format json` Previously, it was allowed by default on nightly, which made it hard to realize the flag wouldn't be accepted on beta or stable. Note that this still allows `--output-format html`, which has been stable since 1.0. - Remove unnecessary double-checking of the feature gate when parsing the output format - Add custom run-make test since compiletest passes -Zunstable-options by default 2021-02-24 21:16:49 +00:00			`// compile-flags: --output-format html`
			`// check-pass`
			// This tests that `--output-format html` is accepted without `-Z unstable-options`,
			`// since it has been stable since 1.0.`