Auto merge of rust-lang#7255 - whatisaphone:feat/similar-names-wparam-lparam, r=giraffate

Allow wparam and lparam in similar_names

`wparam` and `lparam` are often used as generic parameter names in win32 (for example [WindowProc](https://docs.microsoft.com/en-us/previous-versions/windows/desktop/legacy/ms633573(v=vs.85))). This PR adds them to the similar_names exception list.

changelog: [`similar_names`] don't treat wparam and lparam as similar

Author: bors

clippy_lints/src/non_expressive_names.rs

@@ -125,6 +125,7 @@ const ALLOWED_TO_BE_SIMILAR: &[&[&str]] = &[
     &["args", "arms"],
     &["qpath", "path"],
     &["lit", "lint"],
+    &["wparam", "lparam"],
 ];
 
 struct SimilarNamesNameVisitor<'a, 'tcx, 'b>(&'b mut SimilarNamesLocalVisitor<'a, 'tcx>);

tests/ui/similar_names.rs

@@ -72,6 +72,10 @@ fn main() {
     let rx1: i32;
     let tx_cake: i32;
     let rx_cake: i32;
+
+    // names often used in win32 code (for example WindowProc)
+    let wparam: i32;
+    let lparam: i32;
 }
 
 fn foo() {

tests/ui/similar_names.stderr

@@ -92,13 +92,13 @@ LL |     let parsee: i32;
    |         ^^^^^^
 
 error: binding's name is too similar to existing binding
-  --> $DIR/similar_names.rs:81:16
+  --> $DIR/similar_names.rs:85:16
    |
 LL |         bpple: sprang,
    |                ^^^^^^
    |
 note: existing binding defined here
-  --> $DIR/similar_names.rs:80:16
+  --> $DIR/similar_names.rs:84:16
    |
 LL |         apple: spring,
    |                ^^^^^^