[TIMING] ToolBuild { compiler: Compiler { stage: 0, host: TargetSelection { triple: "x86_64-unknown-linux-gnu", file: None } }, target: TargetSelection { triple: "x86_64-unknown-linux-gnu", file: None }, tool: "lint-docs", path: "src/tools/lint-docs", mode: ToolBootstrap, is_optional_tool: false, source_type: InTree, extra_features: [] } -- 5.448
[TIMING] LintDocs { compiler: Compiler { stage: 0, host: TargetSelection { triple: "x86_64-unknown-linux-gnu", file: None } }, target: TargetSelection { triple: "x86_64-unknown-linux-gnu", file: None } } -- 0.000
warning: the code example in lint `stable_features` in /checkout/compiler/rustc_lint_defs/src/builtin.rs failed to generate the expected output: did not find lint `stable_features` in output of example, got:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> lint_example.rs:1:1
1 | #![feature(test_accepted_feature)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
  |
  = help: the feature `test_accepted_feature` has been stable since 1.0.0 and no longer requires an attribute to enable
  = help: the feature `test_accepted_feature` has been stable since 1.0.0 and no longer requires an attribute to enable


error: aborting due to previous error


For more information about this error, try `rustc --explain E0554`.

warning: the code example in lint `unused_allocation` in /checkout/compiler/rustc_lint/src/unused.rs failed to generate the expected output: did not find lint `unused_allocation` in output of example, got:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> lint_example.rs:1:1
1 | #![feature(box_syntax)]
  | ^^^^^^^^^^^^^^^^^^^^^^^


---
[TIMING] RustcBook { compiler: Compiler { stage: 2, host: TargetSelection { triple: "x86_64-unknown-linux-gnu", file: None } } } -- 0.000
Generating lint docs (x86_64-unknown-linux-gnu)
error: failed to test example in lint docs for `stable_features` in /checkout/compiler/rustc_lint_defs/src/builtin.rs:784: did not find lint `stable_features` in output of example, got:

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> lint_example.rs:1:1
1 | #![feature(test_accepted_feature)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
  |
  = help: the feature `test_accepted_feature` has been stable since 1.0.0 and no longer requires an attribute to enable
---

For more information about this error, try `rustc --explain E0554`.


This error was generated by the lint-docs tool.
This tool extracts documentation for lints from the source code and places
them in the rustc book. See the declare_lint! documentation
https://doc.rust-lang.org/nightly/nightly-rustc/rustc_lint_defs/macro.declare_lint.html
for an example of the format of documentation this tool expects.


To re-run these tests, run: ./x.py test --keep-stage=0 src/tools/lint-docs
The --keep-stage flag should be used if you have already built the compiler