Auto merge of #11988 - J-ZhengLi:issue11324, r=Alexendoo

fix suggestion error for [`manual_is_ascii_check`] with missing type

fixes: #11324
fixes: #11776

changelog: improve [`manual_is_ascii_check`] to suggest labeling type in closure, fix FP with type generics, and improve linting on ref expressions.

tests/ui/manual_is_ascii_check.fixed

@@ -55,3 +55,30 @@ fn msrv_1_47() {
     const FOO: bool = 'x'.is_ascii_digit();
     const BAR: bool = 'x'.is_ascii_hexdigit();
 }
+
+#[allow(clippy::deref_addrof, clippy::needless_borrow)]
+fn with_refs() {
+    let cool_letter = &&'g';
+    cool_letter.is_ascii_digit();
+    cool_letter.is_ascii_lowercase();
+}
+
+fn generics() {
+    fn a<U>(u: &U) -> bool
+    where
+        char: PartialOrd<U>,
+        U: PartialOrd<char> + ?Sized,
+    {
+        ('A'..='Z').contains(u)
+    }
+
+    fn take_while<Item, F>(cond: F)
+    where
+        Item: Sized,
+        F: Fn(Item) -> bool,
+    {
+    }
+    take_while(|c: char| c.is_ascii_uppercase());
+    take_while(|c: u8| c.is_ascii_uppercase());
+    take_while(|c: char| c.is_ascii_uppercase());
+}

tests/ui/manual_is_ascii_check.rs

@@ -55,3 +55,30 @@ fn msrv_1_47() {
     const FOO: bool = matches!('x', '0'..='9');
     const BAR: bool = matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F');
 }
+
+#[allow(clippy::deref_addrof, clippy::needless_borrow)]
+fn with_refs() {
+    let cool_letter = &&'g';
+    ('0'..='9').contains(&&cool_letter);
+    ('a'..='z').contains(*cool_letter);
+}
+
+fn generics() {
+    fn a<U>(u: &U) -> bool
+    where
+        char: PartialOrd<U>,
+        U: PartialOrd<char> + ?Sized,
+    {
+        ('A'..='Z').contains(u)
+    }
+
+    fn take_while<Item, F>(cond: F)
+    where
+        Item: Sized,
+        F: Fn(Item) -> bool,
+    {
+    }
+    take_while(|c| ('A'..='Z').contains(&c));
+    take_while(|c| (b'A'..=b'Z').contains(&c));
+    take_while(|c: char| ('A'..='Z').contains(&c));
+}

tests/ui/manual_is_ascii_check.stderr

@@ -133,5 +133,45 @@ error: manual check for common ascii range
 LL |     const BAR: bool = matches!('x', '0'..='9' | 'a'..='f' | 'A'..='F');
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `'x'.is_ascii_hexdigit()`
 
-error: aborting due to 22 previous errors
+error: manual check for common ascii range
+  --> tests/ui/manual_is_ascii_check.rs:62:5
+   |
+LL |     ('0'..='9').contains(&&cool_letter);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cool_letter.is_ascii_digit()`
+
+error: manual check for common ascii range
+  --> tests/ui/manual_is_ascii_check.rs:63:5
+   |
+LL |     ('a'..='z').contains(*cool_letter);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cool_letter.is_ascii_lowercase()`
+
+error: manual check for common ascii range
+  --> tests/ui/manual_is_ascii_check.rs:81:20
+   |
+LL |     take_while(|c| ('A'..='Z').contains(&c));
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: try
+   |
+LL |     take_while(|c: char| c.is_ascii_uppercase());
+   |                 ~~~~~~~  ~~~~~~~~~~~~~~~~~~~~~~
+
+error: manual check for common ascii range
+  --> tests/ui/manual_is_ascii_check.rs:82:20
+   |
+LL |     take_while(|c| (b'A'..=b'Z').contains(&c));
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: try
+   |
+LL |     take_while(|c: u8| c.is_ascii_uppercase());
+   |                 ~~~~~  ~~~~~~~~~~~~~~~~~~~~~~
+
+error: manual check for common ascii range
+  --> tests/ui/manual_is_ascii_check.rs:83:26
+   |
+LL |     take_while(|c: char| ('A'..='Z').contains(&c));
+   |                          ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `c.is_ascii_uppercase()`
+
+error: aborting due to 27 previous errors