Merge pull request #2834 from rust-lang/rustc-pull

Rustc pull update

Author: tshepang

rust-version

@@ -1 +1 @@
-14196dbfa3eb7c30195251eac092b1b86c8a2d84
+17584a181979f04f2aaad867332c22db1caa511a

src/stability.md

@@ -23,6 +23,9 @@ The `unstable` attribute infects all sub-items, where the attribute doesn't
 have to be reapplied. So if you apply this to a module, all items in the module
 will be unstable.
 
+If you rename a feature, you can add `old_name = "old_name"` to produce a 
+useful error message.
+
 You can make specific sub-items stable by using the `#[stable]` attribute on
 them. The stability scheme works similarly to how `pub` works. You can have
 public functions of nonpublic modules and you can have stable functions in
@@ -189,4 +192,11 @@ Currently, the items that can be annotated with `#[unstable_feature_bound]` are:
 - free function
 - trait
 
+## renamed and removed features
+Unstable features can get renamed and removed. If you rename a feature, you can add `old_name = "old_name"` to the `#[unstable]` attribute.
+If you remove a feature, the `#!unstable_removed(feature = "foo", reason = "brief description", link = "link", since = "1.90.0")`
+attribute should be used to produce a good error message for users of the removed feature.
+
+The `link` field can be used to link to the most relevant information on the removal of the feature such as a GitHub issue, comment or PR.
+
 [blog]: https://www.ralfj.de/blog/2018/07/19/const.html

src/tests/compiletest.md

@@ -460,6 +460,15 @@ However, revisions or building auxiliary via directives are not currently suppor
 `rmake.rs` and `run-make-support` may *not* use any nightly/unstable features,
 as they must be compilable by a stage 0 rustc that may be a beta or even stable rustc.
 
+By default, run-make tests print each subprocess command and its stdout/stderr.
+When running with `--no-capture` on `panic=abort` test suites (such as `cg_clif`),
+this can flood the terminal. Omit `--verbose-run-make-subprocess-output` to
+suppress this output for passing tests — failing tests always print regardless:
+
+```bash
+./x test tests/run-make --no-capture --verbose-run-make-subprocess-output=false
+```
+
 #### Quickly check if `rmake.rs` tests can be compiled
 
 You can quickly check if `rmake.rs` tests can be compiled without having to