update unused_braces wording

Author: lcnr

src/librustc_lint/unused.rs

@@ -327,11 +327,11 @@ enum UnusedDelimsCtx {
     AssignedValue,
     IfCond,
     WhileCond,
-    ForHeadExpr,
-    MatchHeadExpr,
+    ForIterExpr,
+    MatchScrutineeExpr,
     ReturnValue,
     BlockRetValue,
-    LetHeadExpr,
+    LetScrutineeExpr,
     ArrayLenExpr,
     AnonConst,
 }
@@ -344,11 +344,11 @@ impl From<UnusedDelimsCtx> for &'static str {
             UnusedDelimsCtx::AssignedValue => "assigned value",
             UnusedDelimsCtx::IfCond => "`if` condition",
             UnusedDelimsCtx::WhileCond => "`while` condition",
-            UnusedDelimsCtx::ForHeadExpr => "`for` head expression",
-            UnusedDelimsCtx::MatchHeadExpr => "`match` head expression",
+            UnusedDelimsCtx::ForIterExpr => "`for` iterator expression",
+            UnusedDelimsCtx::MatchScrutineeExpr => "`match` scrutinee expression",
             UnusedDelimsCtx::ReturnValue => "`return` value",
             UnusedDelimsCtx::BlockRetValue => "block return value",
-            UnusedDelimsCtx::LetHeadExpr => "`let` head expression",
+            UnusedDelimsCtx::LetScrutineeExpr => "`let` scrutinee expression",
             UnusedDelimsCtx::ArrayLenExpr | UnusedDelimsCtx::AnonConst => "const expression",
         }
     }
@@ -399,7 +399,6 @@ trait UnusedDelimLint {
         self.emit_unused_delims(cx, value.span, &expr_text, ctx.into(), keep_space);
     }
 
-    /// emits a lint
     fn emit_unused_delims(
         &self,
         cx: &EarlyContext<'_>,
@@ -471,12 +470,12 @@ trait UnusedDelimLint {
             }
 
             ForLoop(_, ref cond, ref block, ..) => {
-                (cond, UnusedDelimsCtx::ForHeadExpr, true, None, Some(block.span.lo()))
+                (cond, UnusedDelimsCtx::ForIterExpr, true, None, Some(block.span.lo()))
             }
 
             Match(ref head, _) => {
                 let left = e.span.lo() + rustc_span::BytePos(5);
-                (head, UnusedDelimsCtx::MatchHeadExpr, true, Some(left), None)
+                (head, UnusedDelimsCtx::MatchScrutineeExpr, true, Some(left), None)
             }
 
             Ret(Some(ref value)) => {
@@ -597,7 +596,7 @@ impl UnusedDelimLint for UnusedParens {
                 self.check_unused_delims_expr(
                     cx,
                     expr,
-                    UnusedDelimsCtx::LetHeadExpr,
+                    UnusedDelimsCtx::LetScrutineeExpr,
                     followed_by_block,
                     None,
                     None,
@@ -732,7 +731,7 @@ impl EarlyLintPass for UnusedParens {
 declare_lint! {
     pub(super) UNUSED_BRACES,
     Warn,
-    "suggests removing `{` and `}`  in case they are not necessary"
+    "unnecessary braces around an expression"
 }
 
 declare_lint_pass!(UnusedBraces => [UNUSED_BRACES]);
@@ -804,7 +803,7 @@ impl UnusedDelimLint for UnusedBraces {
                 self.check_unused_delims_expr(
                     cx,
                     expr,
-                    UnusedDelimsCtx::LetHeadExpr,
+                    UnusedDelimsCtx::LetScrutineeExpr,
                     followed_by_block,
                     None,
                     None,

src/test/ui/lint/lint-unnecessary-parens.rs

@@ -48,11 +48,11 @@ fn main() {
     if (true) {} //~ ERROR unnecessary parentheses around `if` condition
     while (true) {} //~ ERROR unnecessary parentheses around `while` condition
     //~^ WARN denote infinite loops with
-    match (true) { //~ ERROR unnecessary parentheses around `match` head expression
+    match (true) { //~ ERROR unnecessary parentheses around `match` scrutinee expression
         _ => {}
     }
-    if let 1 = (1) {} //~ ERROR unnecessary parentheses around `let` head expression
-    while let 1 = (2) {} //~ ERROR unnecessary parentheses around `let` head expression
+    if let 1 = (1) {} //~ ERROR unnecessary parentheses around `let` scrutinee expression
+    while let 1 = (2) {} //~ ERROR unnecessary parentheses around `let` scrutinee expression
     let v = X { y: false };
     // struct lits needs parens, so these shouldn't warn.
     if (v == X { y: true }) {}

src/test/ui/lint/lint-unnecessary-parens.stderr

@@ -72,19 +72,19 @@ LL |     while (true) {}
    |
    = note: `#[warn(while_true)]` on by default
 
-error: unnecessary parentheses around `match` head expression
+error: unnecessary parentheses around `match` scrutinee expression
   --> $DIR/lint-unnecessary-parens.rs:51:11
    |
 LL |     match (true) {
    |           ^^^^^^ help: remove these parentheses
 
-error: unnecessary parentheses around `let` head expression
+error: unnecessary parentheses around `let` scrutinee expression
   --> $DIR/lint-unnecessary-parens.rs:54:16
    |
 LL |     if let 1 = (1) {}
    |                ^^^ help: remove these parentheses
 
-error: unnecessary parentheses around `let` head expression
+error: unnecessary parentheses around `let` scrutinee expression
   --> $DIR/lint-unnecessary-parens.rs:55:19
    |
 LL |     while let 1 = (2) {}

src/test/ui/lint/unused_braces.stderr

@@ -22,7 +22,7 @@ note: the lint level is defined here
 LL | #![warn(unused_braces, unused_parens)]
    |         ^^^^^^^^^^^^^
 
-warning: unnecessary braces around `let` head expression
+warning: unnecessary braces around `let` scrutinee expression
   --> $DIR/unused_braces.rs:11:16
    |
 LL |     if let 7 = { 7 } {

src/test/ui/lint/unused_parens_remove_json_suggestion.stderr

@@ -46,14 +46,14 @@ LL |     while(true && false) {
    |          ^^^^^^^^^^^^^^^ help: remove these parentheses
 
 "}
-{"message":"unnecessary parentheses around `for` head expression","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_remove_json_suggestion.rs","byte_start":987,"byte_end":995,"line_start":44,"line_end":44,"column_start":18,"column_end":26,"is_primary":true,"text":[{"text":"        for _ in (0 .. 3){
+{"message":"unnecessary parentheses around `for` iterator expression","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_remove_json_suggestion.rs","byte_start":987,"byte_end":995,"line_start":44,"line_end":44,"column_start":18,"column_end":26,"is_primary":true,"text":[{"text":"        for _ in (0 .. 3){
   --> $DIR/unused_parens_remove_json_suggestion.rs:44:18
    |
 LL |         for _ in (0 .. 3){
    |                  ^^^^^^^^ help: remove these parentheses
 
 "}
-{"message":"unnecessary parentheses around `for` head expression","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_remove_json_suggestion.rs","byte_start":1088,"byte_end":1096,"line_start":49,"line_end":49,"column_start":14,"column_end":22,"is_primary":true,"text":[{"text":"    for _ in (0 .. 3) {
+{"message":"unnecessary parentheses around `for` iterator expression","code":{"code":"unused_parens","explanation":null},"level":"error","spans":[{"file_name":"$DIR/unused_parens_remove_json_suggestion.rs","byte_start":1088,"byte_end":1096,"line_start":49,"line_end":49,"column_start":14,"column_end":22,"is_primary":true,"text":[{"text":"    for _ in (0 .. 3) {
   --> $DIR/unused_parens_remove_json_suggestion.rs:49:14
    |
 LL |     for _ in (0 .. 3) {