Auto merge of #4196 - lzutao:unused-lifetime, r=oli-obk

Remove wrong lifetime from LintContext

Rustup rust-lang/rust#61735

changelog: none

Author: bors

clippy_lints/src/format.rs

@@ -92,7 +92,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for UselessFormat {
     }
 }
 
-fn span_useless_format<'a, 'tcx: 'a, T: LintContext<'tcx>>(cx: &'a T, span: Span, help: &str, mut sugg: String) {
+fn span_useless_format<T: LintContext>(cx: &T, span: Span, help: &str, mut sugg: String) {
     let to_replace = span.source_callsite();
 
     // The callsite span contains the statement semicolon for some reason.

clippy_lints/src/utils/diagnostics.rs

@@ -48,7 +48,7 @@ impl<'a> DiagnosticWrapper<'a> {
 /// 17 |     std::mem::forget(seven);
 ///    |     ^^^^^^^^^^^^^^^^^^^^^^^
 /// ```
-pub fn span_lint<'a, T: LintContext<'a>>(cx: &T, lint: &'static Lint, sp: impl Into<MultiSpan>, msg: &str) {
+pub fn span_lint<T: LintContext>(cx: &T, lint: &'static Lint, sp: impl Into<MultiSpan>, msg: &str) {
     DiagnosticWrapper(cx.struct_span_lint(lint, sp, msg)).docs_link(lint);
 }
 
@@ -70,13 +70,7 @@ pub fn span_lint<'a, T: LintContext<'a>>(cx: &T, lint: &'static Lint, sp: impl I
 ///    |
 ///    = help: Consider using `std::f64::NAN` if you would like a constant representing NaN
 /// ```
-pub fn span_help_and_lint<'a, 'tcx: 'a, T: LintContext<'tcx>>(
-    cx: &'a T,
-    lint: &'static Lint,
-    span: Span,
-    msg: &str,
-    help: &str,
-) {
+pub fn span_help_and_lint<'a, T: LintContext>(cx: &'a T, lint: &'static Lint, span: Span, msg: &str, help: &str) {
     let mut db = DiagnosticWrapper(cx.struct_span_lint(lint, span, msg));
     db.0.help(help);
     db.docs_link(lint);
@@ -103,7 +97,7 @@ pub fn span_help_and_lint<'a, 'tcx: 'a, T: LintContext<'tcx>>(
 /// 10 |     forget(&SomeStruct);
 ///    |            ^^^^^^^^^^^
 /// ```
-pub fn span_note_and_lint<'a, 'tcx: 'a, T: LintContext<'tcx>>(
+pub fn span_note_and_lint<'a, T: LintContext>(
     cx: &'a T,
     lint: &'static Lint,
     span: Span,
@@ -120,13 +114,8 @@ pub fn span_note_and_lint<'a, 'tcx: 'a, T: LintContext<'tcx>>(
     db.docs_link(lint);
 }
 
-pub fn span_lint_and_then<'a, 'tcx: 'a, T: LintContext<'tcx>, F>(
-    cx: &'a T,
-    lint: &'static Lint,
-    sp: Span,
-    msg: &str,
-    f: F,
-) where
+pub fn span_lint_and_then<'a, T: LintContext, F>(cx: &'a T, lint: &'static Lint, sp: Span, msg: &str, f: F)
+where
     F: for<'b> FnOnce(&mut DiagnosticBuilder<'b>),
 {
     let mut db = DiagnosticWrapper(cx.struct_span_lint(lint, sp, msg));
@@ -166,7 +155,7 @@ pub fn span_lint_hir_and_then(
 ///     |
 ///     = note: `-D fold-any` implied by `-D warnings`
 /// ```
-pub fn span_lint_and_sugg<'a, 'tcx: 'a, T: LintContext<'tcx>>(
+pub fn span_lint_and_sugg<'a, T: LintContext>(
     cx: &'a T,
     lint: &'static Lint,
     sp: Span,

clippy_lints/src/utils/mod.rs

@@ -114,7 +114,7 @@ pub fn in_macro(span: Span) -> bool {
 // sources that the user has no control over.
 // For some reason these attributes don't have any expansion info on them, so
 // we have to check it this way until there is a better way.
-pub fn is_present_in_source<'a, T: LintContext<'a>>(cx: &T, span: Span) -> bool {
+pub fn is_present_in_source<T: LintContext>(cx: &T, span: Span) -> bool {
     if let Some(snippet) = snippet_opt(cx, span) {
         if snippet.is_empty() {
             return false;
@@ -455,7 +455,7 @@ pub fn contains_name(name: Name, expr: &Expr) -> bool {
 /// ```rust,ignore
 /// snippet(cx, expr.span, "..")
 /// ```
-pub fn snippet<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
+pub fn snippet<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
     snippet_opt(cx, span).map_or_else(|| Cow::Borrowed(default), From::from)
 }
 
@@ -465,7 +465,7 @@ pub fn snippet<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str)
 /// - If the span is inside a macro, change the applicability level to `MaybeIncorrect`.
 /// - If the default value is used and the applicability level is `MachineApplicable`, change it to
 /// `HasPlaceholders`
-pub fn snippet_with_applicability<'a, 'b, T: LintContext<'b>>(
+pub fn snippet_with_applicability<'a, T: LintContext>(
     cx: &T,
     span: Span,
     default: &'a str,
@@ -487,12 +487,12 @@ pub fn snippet_with_applicability<'a, 'b, T: LintContext<'b>>(
 
 /// Same as `snippet`, but should only be used when it's clear that the input span is
 /// not a macro argument.
-pub fn snippet_with_macro_callsite<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
+pub fn snippet_with_macro_callsite<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
     snippet(cx, span.source_callsite(), default)
 }
 
 /// Converts a span to a code snippet. Returns `None` if not available.
-pub fn snippet_opt<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Option<String> {
+pub fn snippet_opt<T: LintContext>(cx: &T, span: Span) -> Option<String> {
     cx.sess().source_map().span_to_snippet(span).ok()
 }
 
@@ -506,14 +506,14 @@ pub fn snippet_opt<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Option<String>
 /// ```rust,ignore
 /// snippet_block(cx, expr.span, "..")
 /// ```
-pub fn snippet_block<'a, 'b, T: LintContext<'b>>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
+pub fn snippet_block<'a, T: LintContext>(cx: &T, span: Span, default: &'a str) -> Cow<'a, str> {
     let snip = snippet(cx, span, default);
     trim_multiline(snip, true)
 }
 
 /// Same as `snippet_block`, but adapts the applicability level by the rules of
 /// `snippet_with_applicabiliy`.
-pub fn snippet_block_with_applicability<'a, 'b, T: LintContext<'b>>(
+pub fn snippet_block_with_applicability<'a, T: LintContext>(
     cx: &T,
     span: Span,
     default: &'a str,
@@ -524,7 +524,7 @@ pub fn snippet_block_with_applicability<'a, 'b, T: LintContext<'b>>(
 }
 
 /// Returns a new Span that covers the full last line of the given Span
-pub fn last_line_of_span<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Span {
+pub fn last_line_of_span<T: LintContext>(cx: &T, span: Span) -> Span {
     let source_map_and_line = cx.sess().source_map().lookup_line(span.lo()).unwrap();
     let line_no = source_map_and_line.line;
     let line_start = &source_map_and_line.sf.lines[line_no];
@@ -533,12 +533,7 @@ pub fn last_line_of_span<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Span {
 
 /// Like `snippet_block`, but add braces if the expr is not an `ExprKind::Block`.
 /// Also takes an `Option<String>` which can be put inside the braces.
-pub fn expr_block<'a, 'b, T: LintContext<'b>>(
-    cx: &T,
-    expr: &Expr,
-    option: Option<String>,
-    default: &'a str,
-) -> Cow<'a, str> {
+pub fn expr_block<'a, T: LintContext>(cx: &T, expr: &Expr, option: Option<String>, default: &'a str) -> Cow<'a, str> {
     let code = snippet_block(cx, expr.span, default);
     let string = option.unwrap_or_default();
     if in_macro_or_desugar(expr.span) {

clippy_lints/src/utils/sugg.rs

@@ -480,7 +480,7 @@ fn astbinop2assignop(op: ast::BinOp) -> AssocOp {
 
 /// Returns the indentation before `span` if there are nothing but `[ \t]`
 /// before it on its line.
-fn indentation<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Option<String> {
+fn indentation<T: LintContext>(cx: &T, span: Span) -> Option<String> {
     let lo = cx.sess().source_map().lookup_char_pos(span.lo());
     if let Some(line) = lo.file.get_line(lo.line - 1 /* line numbers in `Loc` are 1-based */) {
         if let Some((pos, _)) = line.char_indices().find(|&(_, c)| c != ' ' && c != '\t') {
@@ -499,7 +499,7 @@ fn indentation<'a, T: LintContext<'a>>(cx: &T, span: Span) -> Option<String> {
 }
 
 /// Convenience extension trait for `DiagnosticBuilder`.
-pub trait DiagnosticBuilderExt<'a, T: LintContext<'a>> {
+pub trait DiagnosticBuilderExt<'a, T: LintContext> {
     /// Suggests to add an attribute to an item.
     ///
     /// Correctly handles indentation of the attribute and item.
@@ -546,7 +546,7 @@ pub trait DiagnosticBuilderExt<'a, T: LintContext<'a>> {
     fn suggest_remove_item(&mut self, cx: &T, item: Span, msg: &str, applicability: Applicability);
 }
 
-impl<'a, 'b, 'c, T: LintContext<'c>> DiagnosticBuilderExt<'c, T> for rustc_errors::DiagnosticBuilder<'b> {
+impl<'a, 'b, 'c, T: LintContext> DiagnosticBuilderExt<'c, T> for rustc_errors::DiagnosticBuilder<'b> {
     fn suggest_item_with_attr<D: Display + ?Sized>(
         &mut self,
         cx: &T,