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add suggest for PatternsInWithoutBody

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This commit is contained in:
Daiki Ihara 2020-11-30 23:24:08 +09:00
parent 463ce40428
commit acbebd81d4
3 changed files with 21 additions and 8 deletions
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25
compiler/rustc_ast_passes/src/ast_validation.rs
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@ -16,7 +16,7 @@ use rustc_data_structures::fx::FxHashMap;
use rustc_errors::{error_code, pluralize, struct_span_err, Applicability};
use rustc_parse::validate_attr;
use rustc_session::lint::builtin::PATTERNS_IN_FNS_WITHOUT_BODY;
use rustc_session::lint::LintBuffer;
use rustc_session::lint::{BuiltinLintDiagnostics, LintBuffer};
use rustc_session::Session;
use rustc_span::symbol::{kw, sym, Ident};
use rustc_span::Span;
@ -213,14 +213,14 @@ impl<'a> AstValidator<'a> {
err.emit();
}
fn check_decl_no_pat(decl: &FnDecl, mut report_err: impl FnMut(Span, bool)) {
fn check_decl_no_pat(decl: &FnDecl, mut report_err: impl FnMut(Span, Option<Ident>, bool)) {
for Param { pat, .. } in &decl.inputs {
match pat.kind {
PatKind::Ident(BindingMode::ByValue(Mutability::Not), _, None) | PatKind::Wild => {}
PatKind::Ident(BindingMode::ByValue(Mutability::Mut), _, None) => {
report_err(pat.span, true)
PatKind::Ident(BindingMode::ByValue(Mutability::Mut), ident, None) => {
report_err(pat.span, Some(ident), true)
}
_ => report_err(pat.span, false),
_ => report_err(pat.span, None, false),
}
}
}
@ -815,7 +815,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
match ty.kind {
TyKind::BareFn(ref bfty) => {
self.check_fn_decl(&bfty.decl, SelfSemantic::No);
Self::check_decl_no_pat(&bfty.decl, |span, _| {
Self::check_decl_no_pat(&bfty.decl, |span, _, _| {
struct_span_err!(
self.session,
span,
@ -1285,7 +1285,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
// Functions without bodies cannot have patterns.
if let FnKind::Fn(ctxt, _, sig, _, None) = fk {
Self::check_decl_no_pat(&sig.decl, |span, mut_ident| {
Self::check_decl_no_pat(&sig.decl, |span, ident, mut_ident| {
let (code, msg, label) = match ctxt {
FnCtxt::Foreign => (
error_code!(E0130),
@ -1299,7 +1299,16 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
),
};
if mut_ident && matches!(ctxt, FnCtxt::Assoc(_)) {
self.lint_buffer.buffer_lint(PATTERNS_IN_FNS_WITHOUT_BODY, id, span, msg);
if let Some(ident) = ident {
let diag = BuiltinLintDiagnostics::PatternsInFnsWithoutBody(span, ident);
self.lint_buffer.buffer_lint_with_diagnostic(
PATTERNS_IN_FNS_WITHOUT_BODY,
id,
span,
msg,
diag,
)
}
} else {
self.err_handler()
.struct_span_err(span, msg)

3
compiler/rustc_lint/src/context.rs
View File

@ -596,6 +596,9 @@ pub trait LintContext: Sized {
db.help("to document an item produced by a macro, \
the macro must produce the documentation as part of its expansion");
}
BuiltinLintDiagnostics::PatternsInFnsWithoutBody(span, ident) => {
db.span_suggestion(span, "remove `mut` from the parameter", ident.to_string(), Applicability::MachineApplicable);
}
}
// Rewrap `db`, and pass control to the user.
decorate(LintDiagnosticBuilder::new(db));

1
compiler/rustc_lint_defs/src/lib.rs
View File

@ -253,6 +253,7 @@ pub enum BuiltinLintDiagnostics {
RedundantImport(Vec<(Span, bool)>, Ident),
DeprecatedMacro(Option<Symbol>, Span),
UnusedDocComment(Span),
PatternsInFnsWithoutBody(Span, Ident),
}
/// Lints that are buffered up early on in the `Session` before the