Fix `is_from_proc_macro` patterns

4 files changed, 76 insertions, 3 deletions

diff --git a/tests/ui/doc_unsafe.rs b/tests/ui/doc_unsafe.rs
index 0c8eac5ccff..f7f41c915e3 100644
--- a/tests/ui/doc_unsafe.rs
+++ b/tests/ui/doc_unsafe.rs
@@ -1,6 +1,6 @@
 //@aux-build:proc_macros.rs
 
-#![allow(clippy::let_unit_value)]
+#![allow(clippy::let_unit_value, clippy::needless_pass_by_ref_mut)]
 
 extern crate proc_macros;
 use proc_macros::external;
diff --git a/tests/ui/needless_pass_by_ref_mut.rs b/tests/ui/needless_pass_by_ref_mut.rs
index 25a02bdd2f2..a92197fb0af 100644
--- a/tests/ui/needless_pass_by_ref_mut.rs
+++ b/tests/ui/needless_pass_by_ref_mut.rs
@@ -307,6 +307,19 @@ fn filter_copy<T: Copy>(predicate: &mut impl FnMut(T) -> bool) -> impl FnMut(&T)
     move |&item| predicate(item)
 }
 
+// `is_from_proc_macro` stress tests
+fn _empty_tup(x: &mut (())) {}
+fn _single_tup(x: &mut ((i32,))) {}
+fn _multi_tup(x: &mut ((i32, u32))) {}
+fn _fn(x: &mut (fn())) {}
+#[rustfmt::skip]
+fn _extern_rust_fn(x: &mut extern "Rust" fn()) {}
+fn _extern_c_fn(x: &mut extern "C" fn()) {}
+fn _unsafe_fn(x: &mut unsafe fn()) {}
+fn _unsafe_extern_fn(x: &mut unsafe extern "C" fn()) {}
+fn _fn_with_arg(x: &mut unsafe extern "C" fn(i32)) {}
+fn _fn_with_ret(x: &mut unsafe extern "C" fn() -> (i32)) {}
+
 fn main() {
     let mut u = 0;
     let mut v = vec![0];
diff --git a/tests/ui/needless_pass_by_ref_mut.stderr b/tests/ui/needless_pass_by_ref_mut.stderr
index 92b753276ac..5d1e9515de1 100644
--- a/tests/ui/needless_pass_by_ref_mut.stderr
+++ b/tests/ui/needless_pass_by_ref_mut.stderr
@@ -139,5 +139,65 @@ LL | pub async fn closure4(n: &mut usize) {
    |
    = warning: changing this function will impact semver compatibility
 
-error: aborting due to 21 previous errors
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:311:18
+   |
+LL | fn _empty_tup(x: &mut (())) {}
+   |                  ^^^^^^^^^ help: consider changing to: `&()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:312:19
+   |
+LL | fn _single_tup(x: &mut ((i32,))) {}
+   |                   ^^^^^^^^^^^^^ help: consider changing to: `&(i32,)`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:313:18
+   |
+LL | fn _multi_tup(x: &mut ((i32, u32))) {}
+   |                  ^^^^^^^^^^^^^^^^^ help: consider changing to: `&(i32, u32)`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:314:11
+   |
+LL | fn _fn(x: &mut (fn())) {}
+   |           ^^^^^^^^^^^ help: consider changing to: `&fn()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:316:23
+   |
+LL | fn _extern_rust_fn(x: &mut extern "Rust" fn()) {}
+   |                       ^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&extern "Rust" fn()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:317:20
+   |
+LL | fn _extern_c_fn(x: &mut extern "C" fn()) {}
+   |                    ^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&extern "C" fn()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:318:18
+   |
+LL | fn _unsafe_fn(x: &mut unsafe fn()) {}
+   |                  ^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe fn()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:319:25
+   |
+LL | fn _unsafe_extern_fn(x: &mut unsafe extern "C" fn()) {}
+   |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn()`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:320:20
+   |
+LL | fn _fn_with_arg(x: &mut unsafe extern "C" fn(i32)) {}
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn(i32)`
+
+error: this argument is a mutable reference, but not used mutably
+  --> $DIR/needless_pass_by_ref_mut.rs:321:20
+   |
+LL | fn _fn_with_ret(x: &mut unsafe extern "C" fn() -> (i32)) {}
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing to: `&unsafe extern "C" fn() -> (i32)`
+
+error: aborting due to 31 previous errors
 
diff --git a/tests/ui/unnecessary_unsafety_doc.rs b/tests/ui/unnecessary_unsafety_doc.rs
index 373b18470f6..5ad117eb8db 100644
--- a/tests/ui/unnecessary_unsafety_doc.rs
+++ b/tests/ui/unnecessary_unsafety_doc.rs
@@ -1,6 +1,6 @@
 //@aux-build:proc_macros.rs
 
-#![allow(clippy::let_unit_value)]
+#![allow(clippy::let_unit_value, clippy::needless_pass_by_ref_mut)]
 #![warn(clippy::unnecessary_safety_doc)]
 
 extern crate proc_macros;