Don't suggest removing mut from references in redundant_static_lifetimes

Author: Jarcho

clippy_lints/src/redundant_static_lifetimes.rs

@@ -66,7 +66,7 @@ impl RedundantStaticLifetimes {
                         TyKind::Path(..) | TyKind::Slice(..) | TyKind::Array(..) | TyKind::Tup(..) => {
                             if lifetime.ident.name == rustc_span::symbol::kw::StaticLifetime {
                                 let snip = snippet(cx, borrow_type.ty.span, "<type>");
-                                let sugg = format!("&{snip}");
+                                let sugg = format!("&{}{snip}", borrow_type.mutbl.prefix_str());
                                 span_lint_and_then(
                                     cx,
                                     REDUNDANT_STATIC_LIFETIMES,

tests/ui/redundant_static_lifetimes.fixed

@@ -39,8 +39,14 @@ static STATIC_VAR_TUPLE: &(u8, u8) = &(1, 2); // ERROR Consider removing 'static
 
 static STATIC_VAR_ARRAY: &[u8; 1] = b"T"; // ERROR Consider removing 'static.
 
+static mut STATIC_MUT_SLICE: &mut [u32] = &mut [0];
+
 fn main() {
     let false_positive: &'static str = "test";
+
+    unsafe {
+        STATIC_MUT_SLICE[0] = 0;
+    }
 }
 
 trait Bar {

tests/ui/redundant_static_lifetimes.rs

@@ -39,8 +39,14 @@ static STATIC_VAR_TUPLE: &'static (u8, u8) = &(1, 2); // ERROR Consider removing
 
 static STATIC_VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removing 'static.
 
+static mut STATIC_MUT_SLICE: &'static mut [u32] = &mut [0];
+
 fn main() {
     let false_positive: &'static str = "test";
+
+    unsafe {
+        STATIC_MUT_SLICE[0] = 0;
+    }
 }
 
 trait Bar {

tests/ui/redundant_static_lifetimes.stderr

@@ -97,10 +97,16 @@ LL | static STATIC_VAR_ARRAY: &'static [u8; 1] = b"T"; // ERROR Consider removin
    |                          -^^^^^^^-------- help: consider removing `'static`: `&[u8; 1]`
 
 error: statics have by default a `'static` lifetime
-  --> $DIR/redundant_static_lifetimes.rs:65:16
+  --> $DIR/redundant_static_lifetimes.rs:42:31
+   |
+LL | static mut STATIC_MUT_SLICE: &'static mut [u32] = &mut [0];
+   |                              -^^^^^^^---------- help: consider removing `'static`: `&mut [u32]`
+
+error: statics have by default a `'static` lifetime
+  --> $DIR/redundant_static_lifetimes.rs:71:16
    |
 LL |     static V: &'static u8 = &17;
    |               -^^^^^^^--- help: consider removing `'static`: `&u8`
 
-error: aborting due to 17 previous errors
+error: aborting due to 18 previous errors