Auto merge of #87152 - flip1995:clippyup, r=Manishearth

Update Clippy

r? `@Manishearth`

Author: bors

Diff for: src/tools/clippy/CHANGELOG.md

@@ -2744,6 +2744,7 @@ Released 2018-09-13
 [`range_step_by_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#range_step_by_zero
 [`range_zip_with_len`]: https://rust-lang.github.io/rust-clippy/master/index.html#range_zip_with_len
 [`rc_buffer`]: https://rust-lang.github.io/rust-clippy/master/index.html#rc_buffer
+[`rc_mutex`]: https://rust-lang.github.io/rust-clippy/master/index.html#rc_mutex
 [`redundant_allocation`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_allocation
 [`redundant_clone`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_clone
 [`redundant_closure`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure
@@ -2797,6 +2798,7 @@ Released 2018-09-13
 [`string_from_utf8_as_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_from_utf8_as_bytes
 [`string_lit_as_bytes`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
 [`string_to_string`]: https://rust-lang.github.io/rust-clippy/master/index.html#string_to_string
+[`strlen_on_c_strings`]: https://rust-lang.github.io/rust-clippy/master/index.html#strlen_on_c_strings
 [`struct_excessive_bools`]: https://rust-lang.github.io/rust-clippy/master/index.html#struct_excessive_bools
 [`suboptimal_flops`]: https://rust-lang.github.io/rust-clippy/master/index.html#suboptimal_flops
 [`suspicious_arithmetic_impl`]: https://rust-lang.github.io/rust-clippy/master/index.html#suspicious_arithmetic_impl

Diff for: src/tools/clippy/clippy_lints/src/cargo_common_metadata.rs

@@ -2,8 +2,7 @@
 
 use std::path::PathBuf;
 
-use clippy_utils::diagnostics::span_lint;
-use clippy_utils::run_lints;
+use clippy_utils::{diagnostics::span_lint, is_lint_allowed};
 use rustc_hir::{hir_id::CRATE_HIR_ID, Crate};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_tool_lint, impl_lint_pass};
@@ -85,7 +84,7 @@ fn is_empty_vec(value: &[String]) -> bool {
 
 impl LateLintPass<'_> for CargoCommonMetadata {
     fn check_crate(&mut self, cx: &LateContext<'_>, _: &Crate<'_>) {
-        if !run_lints(cx, &[CARGO_COMMON_METADATA], CRATE_HIR_ID) {
+        if is_lint_allowed(cx, CARGO_COMMON_METADATA, CRATE_HIR_ID) {
             return;
         }
 

Diff for: src/tools/clippy/clippy_lints/src/copies.rs

@@ -2,7 +2,7 @@ use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_then};
 use clippy_utils::source::{first_line_of_span, indent_of, reindent_multiline, snippet, snippet_opt};
 use clippy_utils::{
     both, count_eq, eq_expr_value, get_enclosing_block, get_parent_expr, if_sequence, in_macro, is_else_clause,
-    run_lints, search_same, ContainsName, SpanlessEq, SpanlessHash,
+    is_lint_allowed, search_same, ContainsName, SpanlessEq, SpanlessHash,
 };
 use if_chain::if_chain;
 use rustc_data_structures::fx::FxHashSet;
@@ -120,7 +120,10 @@ declare_clippy_lint! {
     ///
     /// **Why is this bad?** Duplicate code is less maintainable.
     ///
-    /// **Known problems:** Hopefully none.
+    /// **Known problems:**
+    /// * The lint doesn't check if the moved expressions modify values that are beeing used in
+    ///   the if condition. The suggestion can in that case modify the behavior of the program.
+    ///   See [rust-clippy#7452](https://github.com/rust-lang/rust-clippy/issues/7452)
     ///
     /// **Example:**
     /// ```ignore
@@ -337,8 +340,8 @@ fn scan_block_for_eq(cx: &LateContext<'tcx>, blocks: &[&Block<'tcx>]) -> Option<
             if block_expr_eq;
             if l_stmts.len() == r_stmts.len();
             if l_stmts.len() == current_start_eq;
-            if run_lints(cx, &[IF_SAME_THEN_ELSE], win[0].hir_id);
-            if run_lints(cx, &[IF_SAME_THEN_ELSE], win[1].hir_id);
+            if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, win[0].hir_id);
+            if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, win[1].hir_id);
             then {
                 span_lint_and_note(
                     cx,
@@ -358,8 +361,7 @@ fn scan_block_for_eq(cx: &LateContext<'tcx>, blocks: &[&Block<'tcx>]) -> Option<
         expr_eq &= block_expr_eq;
     }
 
-    let has_expr = blocks[0].expr.is_some();
-    if has_expr && !expr_eq {
+    if !expr_eq {
         end_eq = 0;
     }
 

Diff for: src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs

@@ -1,5 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::source::snippet;
+use clippy_utils::numeric_literal;
+use clippy_utils::source::snippet_opt;
 use if_chain::if_chain;
 use rustc_ast::ast::{LitFloatType, LitIntType, LitKind};
 use rustc_errors::Applicability;
@@ -78,16 +79,25 @@ impl<'a, 'tcx> NumericFallbackVisitor<'a, 'tcx> {
                 if let Some(ty_bound) = self.ty_bounds.last();
                 if matches!(lit.node,
                             LitKind::Int(_, LitIntType::Unsuffixed) | LitKind::Float(_, LitFloatType::Unsuffixed));
-                if !ty_bound.is_integral();
+                if !ty_bound.is_numeric();
                 then {
-                    let suffix = match lit_ty.kind() {
-                        ty::Int(IntTy::I32) => "i32",
-                        ty::Float(FloatTy::F64) => "f64",
+                    let (suffix, is_float) = match lit_ty.kind() {
+                        ty::Int(IntTy::I32) => ("i32", false),
+                        ty::Float(FloatTy::F64) => ("f64", true),
                         // Default numeric fallback never results in other types.
                         _ => return,
                     };
 
-                    let sugg = format!("{}_{}", snippet(self.cx, lit.span, ""), suffix);
+                    let src = if let Some(src) = snippet_opt(self.cx, lit.span) {
+                        src
+                    } else {
+                        match lit.node {
+                            LitKind::Int(src, _) => format!("{}", src),
+                            LitKind::Float(src, _) => format!("{}", src),
+                            _ => return,
+                        }
+                    };
+                    let sugg = numeric_literal::format(&src, Some(suffix), is_float);
                     span_lint_and_sugg(
                         self.cx,
                         DEFAULT_NUMERIC_FALLBACK,
@@ -219,10 +229,10 @@ enum TyBound<'tcx> {
 }
 
 impl<'tcx> TyBound<'tcx> {
-    fn is_integral(self) -> bool {
+    fn is_numeric(self) -> bool {
         match self {
             TyBound::Any => true,
-            TyBound::Ty(t) => t.is_integral(),
+            TyBound::Ty(t) => t.is_numeric(),
             TyBound::Nothing => false,
         }
     }

Diff for: src/tools/clippy/clippy_lints/src/dereference.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_context;
 use clippy_utils::ty::peel_mid_ty_refs;
-use clippy_utils::{get_parent_node, in_macro, is_allowed};
+use clippy_utils::{get_parent_node, in_macro, is_lint_allowed};
 use rustc_ast::util::parser::PREC_PREFIX;
 use rustc_errors::Applicability;
 use rustc_hir::{BorrowKind, Expr, ExprKind, HirId, MatchSource, Mutability, Node, UnOp};
@@ -107,7 +107,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing {
 
                 match kind {
                     RefOp::Method(target_mut)
-                        if !is_allowed(cx, EXPLICIT_DEREF_METHODS, expr.hir_id)
+                        if !is_lint_allowed(cx, EXPLICIT_DEREF_METHODS, expr.hir_id)
                             && is_linted_explicit_deref_position(parent, expr.hir_id, expr.span) =>
                     {
                         self.state = Some((

Diff for: src/tools/clippy/clippy_lints/src/derive.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_note, span_lint_and_then};
 use clippy_utils::paths;
 use clippy_utils::ty::{implements_trait, is_copy};
-use clippy_utils::{get_trait_def_id, is_allowed, is_automatically_derived, match_def_path};
+use clippy_utils::{get_trait_def_id, is_automatically_derived, is_lint_allowed, match_def_path};
 use if_chain::if_chain;
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{walk_expr, walk_fn, walk_item, FnKind, NestedVisitorMap, Visitor};
@@ -362,7 +362,7 @@ fn check_unsafe_derive_deserialize<'tcx>(
         if let ty::Adt(def, _) = ty.kind();
         if let Some(local_def_id) = def.did.as_local();
         let adt_hir_id = cx.tcx.hir().local_def_id_to_hir_id(local_def_id);
-        if !is_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id);
+        if !is_lint_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id);
         if cx.tcx.inherent_impls(def.did)
             .iter()
             .map(|imp_did| item_from_def_id(cx, *imp_did))

Diff for: src/tools/clippy/clippy_lints/src/doc.rs

@@ -550,7 +550,7 @@ fn check_doc<'a, Events: Iterator<Item = (pulldown_cmark::Event<'a>, Range<usize
             FootnoteReference(text) | Text(text) => {
                 let (begin, span) = get_current_span(spans, range.start);
                 paragraph_span = paragraph_span.with_hi(span.hi());
-                ticks_unbalanced |= text.contains('`');
+                ticks_unbalanced |= text.contains('`') && !in_code;
                 if Some(&text) == in_link.as_ref() || ticks_unbalanced {
                     // Probably a link of the form `<http://example.com>`
                     // Which are represented as a link to "http://example.com" with
@@ -595,7 +595,7 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                 let handler = Handler::with_emitter(false, None, box emitter);
                 let sess = ParseSess::with_span_handler(handler, sm);
 
-                let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code.into()) {
+                let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code) {
                     Ok(p) => p,
                     Err(errs) => {
                         for mut err in errs {
@@ -653,7 +653,10 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
     // Because of the global session, we need to create a new session in a different thread with
     // the edition we need.
     let text = text.to_owned();
-    if thread::spawn(move || has_needless_main(text, edition)).join().expect("thread::spawn failed") {
+    if thread::spawn(move || has_needless_main(text, edition))
+        .join()
+        .expect("thread::spawn failed")
+    {
         span_lint(cx, NEEDLESS_DOCTEST_MAIN, span, "needless `fn main` in doctest");
     }
 }

Diff for: src/tools/clippy/clippy_lints/src/eta_reduction.rs

@@ -1,15 +1,16 @@
 use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
-use clippy_utils::higher;
 use clippy_utils::higher::VecArgs;
 use clippy_utils::source::snippet_opt;
 use clippy_utils::ty::{implements_trait, type_is_unsafe_function};
+use clippy_utils::usage::UsedAfterExprVisitor;
+use clippy_utils::{get_enclosing_loop_or_closure, higher};
 use clippy_utils::{is_adjusted, iter_input_pats};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::{def_id, Expr, ExprKind, Param, PatKind, QPath};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
-use rustc_middle::ty::{self, Ty};
+use rustc_middle::ty::{self, ClosureKind, Ty};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 
 declare_clippy_lint! {
@@ -86,7 +87,7 @@ impl<'tcx> LateLintPass<'tcx> for EtaReduction {
     }
 }
 
-fn check_closure(cx: &LateContext<'_>, expr: &Expr<'_>) {
+fn check_closure<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
     if let ExprKind::Closure(_, decl, eid, _, _) = expr.kind {
         let body = cx.tcx.hir().body(eid);
         let ex = &body.value;
@@ -131,7 +132,18 @@ fn check_closure(cx: &LateContext<'_>, expr: &Expr<'_>) {
 
             then {
                 span_lint_and_then(cx, REDUNDANT_CLOSURE, expr.span, "redundant closure", |diag| {
-                    if let Some(snippet) = snippet_opt(cx, caller.span) {
+                    if let Some(mut snippet) = snippet_opt(cx, caller.span) {
+                        if_chain! {
+                            if let ty::Closure(_, substs) = fn_ty.kind();
+                            if let ClosureKind::FnMut = substs.as_closure().kind();
+                            if UsedAfterExprVisitor::is_found(cx, caller)
+                                || get_enclosing_loop_or_closure(cx.tcx, expr).is_some();
+
+                            then {
+                                // Mutable closure is used after current expr; we cannot consume it.
+                                snippet = format!("&mut {}", snippet);
+                            }
+                        }
                         diag.span_suggestion(
                             expr.span,
                             "replace the closure with the function itself",