Remove unnecessary symbols and add missing symbols

Signed-off-by: cuishuang <imcusg@gmail.com>

clippy_lints/src/methods/unnecessary_to_owned.rs

@@ -717,7 +717,7 @@ fn check_if_applicable_to_argument<'tcx>(cx: &LateContext<'tcx>, arg: &Expr<'tcx
 // check that:
 // 1. This is a method with only one argument that doesn't come from a trait.
 // 2. That it has `Borrow` in its generic predicates.
-// 3. `Self` is a std "map type" (ie `HashSet`, `HashMap`, BTreeSet`, `BTreeMap`).
+// 3. `Self` is a std "map type" (ie `HashSet`, `HashMap`, `BTreeSet`, `BTreeMap`).
 fn check_borrow_predicate<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>) {
     if let ExprKind::MethodCall(_, caller, &[arg], _) = expr.kind
         && let Some(method_def_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id)

tests/ui/crashes/ice-3969.rs

@@ -1,7 +1,7 @@
 // https://github.com/rust-lang/rust-clippy/issues/3969
 // used to crash: error: internal compiler error:
 // src/librustc_traits/normalize_erasing_regions.rs:43: could not fully normalize `<i32 as
-// std::iter::Iterator>::Item test from rustc ./ui/trivial-bounds/trivial-bounds-inconsistent.rs
+// std::iter::Iterator>::Item` test from rustc ./ui/trivial-bounds/trivial-bounds-inconsistent.rs
 
 // Check that tautalogically false bounds are accepted, and are used
 // in type inference.
@@ -18,7 +18,7 @@ struct Dst<X: ?Sized> {
 struct TwoStrs(str, str)
 where
     str: Sized;
-//~^ ERROR: trait bound str: std::marker::Sized does not depend on any type or lifetim
+//~^ ERROR: trait bound str: std::marker::Sized does not depend on any type or lifetime
 //~| NOTE: `-D trivial-bounds` implied by `-D warnings`
 
 fn unsized_local()

tests/ui/crashes/ice-6251.rs

@@ -1,5 +1,5 @@
 // originally from glacier/fixed/77329.rs
-// assertion failed: `(left == right) ; different DefIds
+// assertion failed: `(left == right)` ; different DefIds
 //@no-rustfix
 fn bug<T>() -> impl Iterator<Item = [(); { |x: [u8]| x }]> {
     std::iter::empty()

tests/ui/floating_point_arithmetic_nostd.rs

@@ -4,7 +4,7 @@
 #![no_std]
 
 // The following should not lint, as the suggested methods `{f16,f32,f64,f128}.mul_add()`
-// and ``{f16,f32,f64,f128}::abs()` are not available in no_std
+// and `{f16,f32,f64,f128}::abs()` are not available in no_std
 
 pub fn mul_add() {
     let a: f64 = 1234.567;

tests/ui/unsafe_removed_from_name.rs

@@ -7,7 +7,7 @@ use std::cell::UnsafeCell as TotallySafeCell;
 //~| NOTE: `-D clippy::unsafe-removed-from-name` implied by `-D warnings`
 
 use std::cell::UnsafeCell as TotallySafeCellAgain;
-//~^ ERROR: removed `unsafe` from the name of `UnsafeCell` in use as `TotallySafeCellAgain
+//~^ ERROR: removed `unsafe` from the name of `UnsafeCell` in use as `TotallySafeCellAgain`
 
 // Shouldn't error
 use std::cell::RefCell as ProbablyNotUnsafe;