Add pretty-printer parenthesis insertion test #133730
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…llaumeGomez Rollup of 13 pull requests Successful merges: - rust-lang#133603 (Eliminate magic numbers from expression precedence) - rust-lang#133715 (rustdoc-json: Include safety of `static`s) - rust-lang#133721 (rustdoc-json: Add test for `impl Trait for dyn Trait`) - rust-lang#133725 (Remove `//@ compare-output-lines-by-subset`) - rust-lang#133730 (Add pretty-printer parenthesis insertion test) - rust-lang#133736 (Add `needs-target-has-atomic` directive) - rust-lang#133739 (Re-add myself to rotation) - rust-lang#133743 (Fix docs for `<[T]>::as_array`.) - rust-lang#133744 (Fix typo README.md) - rust-lang#133745 (Remove static HashSet for default IDs list) - rust-lang#133749 (mir validator: don't store mir phase) - rust-lang#133751 (remove `Ty::is_copy_modulo_regions`) - rust-lang#133757 (`impl Default for EarlyDiagCtxt`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#133730 - dtolnay:parentest, r=compiler-errors Add pretty-printer parenthesis insertion test This test demonstrates numerous bugs in rustc_ast_pretty, including all five of: - Failing to insert parentheses where necessary to preserve the meaning of a syntax tree, producing invalid syntax. - Failing to insert parentheses, producing valid syntax with the wrong meaning. - Inserting too many parentheses. - Inserting parentheses in the wrong place, producing invalid syntax. - Losing syntactically significant parts of the syntax tree. These pretty-printer bugs have consequences for `-Zunpretty=expanded`. The `cargo expand` subcommand cannot work reliably unless rustc can consistently produce valid Rust output. Erroneous syntax cannot be passed through rustfmt, or queried with [syn-select](https://crates.io/crates/syn-select). The test in this PR is a port of a test from Syn that tests the automatic parenthesis insertion performed by Syn's `ToTokens` impls. In Syn we actually run this test over every expression in every Rust source file in the whole rust-lang/rust repo, including rustc and the standard library and tools and test suites. For the test here, I have only used a small selection of interesting expressions. This will serve as an easy spot to accumulate regression tests as the various bugs get fixed. Once rustc's pretty-printer is in better shape, it's possible that the test can be expanded to cover a larger set of expressions collected automatically like in Syn.
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This test demonstrates numerous bugs in rustc_ast_pretty, including all five of:
These pretty-printer bugs have consequences for
-Zunpretty=expanded. Thecargo expandsubcommand cannot work reliably unless rustc can consistently produce valid Rust output. Erroneous syntax cannot be passed through rustfmt, or queried with syn-select.The test in this PR is a port of a test from Syn that tests the automatic parenthesis insertion performed by Syn's
ToTokensimpls. In Syn we actually run this test over every expression in every Rust source file in the whole rust-lang/rust repo, including rustc and the standard library and tools and test suites. For the test here, I have only used a small selection of interesting expressions. This will serve as an easy spot to accumulate regression tests as the various bugs get fixed. Once rustc's pretty-printer is in better shape, it's possible that the test can be expanded to cover a larger set of expressions collected automatically like in Syn.