Auto merge of #75534 - Aaron1011:feature/new-future-breakage, r=pnkfelix
Implement rustc side of report-future-incompat cc https://github.com/rust-lang/rust/issues/71249 This is an alternative to `@pnkfelix's` initial implementation in https://github.com/pnkfelix/rust/commits/prototype-rustc-side-of-report-future-incompat (mainly because I started working before seeing that branch 😄 ). My approach outputs the entire original `Diagnostic`, in a way that is compatible with incremental compilation. This is not yet integrated with compiletest, but can be used manually by passing `-Z emit-future-incompat-report` to `rustc`. Several changes are made to support this feature: * The `librustc_session/lint` module is moved to a new crate `librustc_lint_defs` (name bikesheddable). This allows accessing lint definitions from `librustc_errors`. * The `Lint` struct is extended with an `Option<FutureBreakage>`. When present, it indicates that we should display a lint in the future-compat report. `FutureBreakage` contains additional information that we may want to display in the report (currently, a `date` field indicating when the crate will stop compiling). * A new variant `rustc_error::Level::Allow` is added. This is used when constructing a diagnostic for a future-breakage lint that is marked as allowed (via `#[allow]` or `--cap-lints`). This allows us to capture any future-breakage diagnostics in one place, while still discarding them before they are passed to the `Emitter`. * `DiagnosticId::Lint` is extended with a `has_future_breakage` field, indicating whether or not the `Lint` has future breakage information (and should therefore show up in the report). * `Session` is given access to the `LintStore` via a new `SessionLintStore` trait (since `librustc_session` cannot directly reference `LintStore` without a cyclic dependency). We use this to turn a string `DiagnosticId::Lint` back into a `Lint`, to retrieve the `FutureBreakage` data. Currently, `FutureBreakage.date` is always set to `None`. However, this could potentially be interpreted by Cargo in the future. I've enabled the future-breakage report for the `ARRAY_INTO_ITER` lint, which can be used to test out this PR. The intent is to use the field to allow Cargo to determine the date of future breakage (as described in [RFC 2834](https://github.com/rust-lang/rfcs/blob/master/text/2834-cargo-report-future-incompat.md)) without needing to parse the diagnostic itself. cc `@pnkfelix`
This commit is contained in:
commit
b202532608
28 changed files with 539 additions and 123 deletions
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@ -3,7 +3,7 @@ use rustc_errors::Applicability;
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use rustc_hir as hir;
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use rustc_middle::ty;
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use rustc_middle::ty::adjustment::{Adjust, Adjustment};
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use rustc_session::lint::FutureIncompatibleInfo;
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use rustc_session::lint::FutureBreakage;
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use rustc_span::symbol::sym;
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declare_lint! {
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@ -38,6 +38,9 @@ declare_lint! {
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@future_incompatible = FutureIncompatibleInfo {
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reference: "issue #66145 <https://github.com/rust-lang/rust/issues/66145>",
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edition: None,
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future_breakage: Some(FutureBreakage {
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date: None
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})
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};
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}
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@ -44,7 +44,6 @@ use rustc_middle::lint::LintDiagnosticBuilder;
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::subst::{GenericArgKind, Subst};
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use rustc_middle::ty::{self, layout::LayoutError, Ty, TyCtxt};
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use rustc_session::lint::FutureIncompatibleInfo;
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use rustc_session::Session;
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use rustc_span::edition::Edition;
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use rustc_span::source_map::Spanned;
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@ -22,7 +22,7 @@ use rustc_ast as ast;
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use rustc_ast::util::lev_distance::find_best_match_for_name;
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use rustc_data_structures::fx::FxHashMap;
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use rustc_data_structures::sync;
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use rustc_errors::{struct_span_err, Applicability};
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use rustc_errors::{add_elided_lifetime_in_path_suggestion, struct_span_err, Applicability};
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use rustc_hir as hir;
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use rustc_hir::def::Res;
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use rustc_hir::def_id::{CrateNum, DefId};
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@ -33,9 +33,10 @@ use rustc_middle::middle::stability;
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use rustc_middle::ty::layout::{LayoutError, TyAndLayout};
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::{self, print::Printer, subst::GenericArg, Ty, TyCtxt};
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use rustc_session::lint::{add_elided_lifetime_in_path_suggestion, BuiltinLintDiagnostics};
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use rustc_session::lint::BuiltinLintDiagnostics;
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use rustc_session::lint::{FutureIncompatibleInfo, Level, Lint, LintBuffer, LintId};
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use rustc_session::Session;
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use rustc_session::SessionLintStore;
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use rustc_span::{symbol::Symbol, MultiSpan, Span, DUMMY_SP};
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use rustc_target::abi::LayoutOf;
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@ -69,6 +70,20 @@ pub struct LintStore {
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lint_groups: FxHashMap<&'static str, LintGroup>,
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}
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impl SessionLintStore for LintStore {
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fn name_to_lint(&self, lint_name: &str) -> LintId {
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let lints = self
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.find_lints(lint_name)
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.unwrap_or_else(|_| panic!("Failed to find lint with name `{}`", lint_name));
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if let &[lint] = lints.as_slice() {
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return lint;
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} else {
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panic!("Found mutliple lints with name `{}`: {:?}", lint_name, lints);
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}
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}
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}
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/// The target of the `by_name` map, which accounts for renaming/deprecation.
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enum TargetLint {
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/// A direct lint target
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@ -543,7 +558,7 @@ pub trait LintContext: Sized {
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anon_lts,
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) => {
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add_elided_lifetime_in_path_suggestion(
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sess,
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sess.source_map(),
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&mut db,
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n,
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path_span,
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