Fix the wording of help msg for bitwise not

compiler/rustc_error_messages/locales/en-US/parser.ftl

@@ -47,15 +47,17 @@ parser_invalid_comparison_operator = invalid comparison operator `{$invalid}`
     .spaceship_operator_invalid = `<=>` is not a valid comparison operator, use `std::cmp::Ordering`
 
 parser_invalid_logical_operator = `{$incorrect}` is not a logical operator
-    .note = unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+    .note = unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
     .use_amp_amp_for_conjunction = use `&&` to perform logical conjunction
     .use_pipe_pipe_for_disjunction = use `||` to perform logical disjunction
 
 parser_tilde_is_not_unary_operator = `~` cannot be used as a unary operator
     .suggestion = use `!` to perform bitwise not
 
 parser_unexpected_token_after_not = unexpected {$negated_desc} after identifier
-    .suggestion = use `!` to perform logical negation
+parser_unexpected_token_after_not_bitwise = use `!` to perform bitwise not
+parser_unexpected_token_after_not_logical = use `!` to perform logical negation
+parser_unexpected_token_after_not_default = use `!` to perform logical negation or bitwise not
 
 parser_malformed_loop_label = malformed loop label
     .suggestion = use the correct loop label format

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -430,8 +430,32 @@ pub(crate) struct NotAsNegationOperator {
     #[primary_span]
     pub negated: Span,
     pub negated_desc: String,
-    #[suggestion_short(applicability = "machine-applicable", code = "!")]
-    pub not: Span,
+    #[subdiagnostic]
+    pub sub: NotAsNegationOperatorSub,
+}
+
+#[derive(SessionSubdiagnostic)]
+pub enum NotAsNegationOperatorSub {
+    #[suggestion_short(
+        parser::unexpected_token_after_not_default,
+        applicability = "machine-applicable",
+        code = "!"
+    )]
+    SuggestNotDefault(#[primary_span] Span),
+
+    #[suggestion_short(
+        parser::unexpected_token_after_not_bitwise,
+        applicability = "machine-applicable",
+        code = "!"
+    )]
+    SuggestNotBitwise(#[primary_span] Span),
+
+    #[suggestion_short(
+        parser::unexpected_token_after_not_logical,
+        applicability = "machine-applicable",
+        code = "!"
+    )]
+    SuggestNotLogical(#[primary_span] Span),
 }
 
 #[derive(SessionDiagnostic)]

compiler/rustc_parse/src/parser/expr.rs

@@ -6,8 +6,9 @@ use super::diagnostics::{
     InvalidComparisonOperatorSub, InvalidLogicalOperator, InvalidLogicalOperatorSub,
     LeftArrowOperator, LifetimeInBorrowExpression, MacroInvocationWithQualifiedPath,
     MalformedLoopLabel, MissingInInForLoop, MissingInInForLoopSub, MissingSemicolonBeforeArray,
-    NotAsNegationOperator, OuterAttributeNotAllowedOnIfElse, RequireColonAfterLabeledExpression,
-    SnapshotParser, TildeAsUnaryOperator, UnexpectedTokenAfterLabel,
+    NotAsNegationOperator, NotAsNegationOperatorSub, OuterAttributeNotAllowedOnIfElse,
+    RequireColonAfterLabeledExpression, SnapshotParser, TildeAsUnaryOperator,
+    UnexpectedTokenAfterLabel,
 };
 use super::pat::{CommaRecoveryMode, RecoverColon, RecoverComma, PARAM_EXPECTED};
 use super::ty::{AllowPlus, RecoverQPath, RecoverReturnSign};
@@ -660,12 +661,23 @@ impl<'a> Parser<'a> {
     fn recover_not_expr(&mut self, lo: Span) -> PResult<'a, (Span, ExprKind)> {
         // Emit the error...
         let negated_token = self.look_ahead(1, |t| t.clone());
+
+        let sub_diag = if negated_token.is_numeric_lit() {
+            NotAsNegationOperatorSub::SuggestNotBitwise
+        } else if negated_token.is_bool_lit() {
+            NotAsNegationOperatorSub::SuggestNotLogical
+        } else {
+            NotAsNegationOperatorSub::SuggestNotDefault
+        };
+
         self.sess.emit_err(NotAsNegationOperator {
             negated: negated_token.span,
             negated_desc: super::token_descr(&negated_token),
             // Span the `not` plus trailing whitespace to avoid
             // trailing whitespace after the `!` in our suggestion
-            not: self.sess.source_map().span_until_non_whitespace(lo.to(negated_token.span)),
+            sub: sub_diag(
+                self.sess.source_map().span_until_non_whitespace(lo.to(negated_token.span)),
+            ),
         });
 
         // ...and recover!

src/test/ui/did_you_mean/issue-41679-tilde-bitwise-negation-attempt.fixed

@@ -2,4 +2,9 @@
 
 fn main() {
     let _x = !1; //~ ERROR cannot be used as a unary operator
+    let _y = !1; //~ ERROR unexpected `1` after identifier
+    let _z = !false; //~ ERROR unexpected keyword `false` after identifier
+    let _a = !true; //~ ERROR unexpected keyword `true` after identifier
+    let v = 1 + 2;
+    let _v = !v; //~ ERROR unexpected `v` after identifier
 }

src/test/ui/did_you_mean/issue-41679-tilde-bitwise-negation-attempt.rs

@@ -2,4 +2,9 @@
 
 fn main() {
     let _x = ~1; //~ ERROR cannot be used as a unary operator
+    let _y = not 1; //~ ERROR unexpected `1` after identifier
+    let _z = not false; //~ ERROR unexpected keyword `false` after identifier
+    let _a = not true; //~ ERROR unexpected keyword `true` after identifier
+    let v = 1 + 2;
+    let _v = not v; //~ ERROR unexpected `v` after identifier
 }

src/test/ui/did_you_mean/issue-41679-tilde-bitwise-negation-attempt.stderr

@@ -4,5 +4,37 @@ error: `~` cannot be used as a unary operator
 LL |     let _x = ~1;
    |              ^ help: use `!` to perform bitwise not
 
-error: aborting due to previous error
+error: unexpected `1` after identifier
+  --> $DIR/issue-41679-tilde-bitwise-negation-attempt.rs:5:18
+   |
+LL |     let _y = not 1;
+   |              ----^
+   |              |
+   |              help: use `!` to perform bitwise not
+
+error: unexpected keyword `false` after identifier
+  --> $DIR/issue-41679-tilde-bitwise-negation-attempt.rs:6:18
+   |
+LL |     let _z = not false;
+   |              ----^^^^^
+   |              |
+   |              help: use `!` to perform logical negation
+
+error: unexpected keyword `true` after identifier
+  --> $DIR/issue-41679-tilde-bitwise-negation-attempt.rs:7:18
+   |
+LL |     let _a = not true;
+   |              ----^^^^
+   |              |
+   |              help: use `!` to perform logical negation
+
+error: unexpected `v` after identifier
+  --> $DIR/issue-41679-tilde-bitwise-negation-attempt.rs:9:18
+   |
+LL |     let _v = not v;
+   |              ----^
+   |              |
+   |              help: use `!` to perform logical negation or bitwise not
+
+error: aborting due to 5 previous errors
 

src/test/ui/did_you_mean/issue-46836-identifier-not-instead-of-negation.stderr

@@ -4,21 +4,21 @@ error: unexpected `for_you` after identifier
 LL |     if not for_you {
    |        ----^^^^^^^
    |        |
-   |        help: use `!` to perform logical negation
+   |        help: use `!` to perform logical negation or bitwise not
 
 error: unexpected `the_worst` after identifier
   --> $DIR/issue-46836-identifier-not-instead-of-negation.rs:11:15
    |
 LL |     while not the_worst {
    |           ----^^^^^^^^^
    |           |
-   |           help: use `!` to perform logical negation
+   |           help: use `!` to perform logical negation or bitwise not
 
 error: unexpected `println` after identifier
   --> $DIR/issue-46836-identifier-not-instead-of-negation.rs:20:9
    |
 LL |     if not  // lack of braces is [sic]
-   |        ----- help: use `!` to perform logical negation
+   |        ----- help: use `!` to perform logical negation or bitwise not
 LL |         println!("Then when?");
    |         ^^^^^^^
 
@@ -42,15 +42,15 @@ error: unexpected `2` after identifier
 LL |     let resource = not 2;
    |                    ----^
    |                    |
-   |                    help: use `!` to perform logical negation
+   |                    help: use `!` to perform bitwise not
 
 error: unexpected `be_smothered_out_before` after identifier
   --> $DIR/issue-46836-identifier-not-instead-of-negation.rs:32:27
    |
 LL |     let young_souls = not be_smothered_out_before;
    |                       ----^^^^^^^^^^^^^^^^^^^^^^^
    |                       |
-   |                       help: use `!` to perform logical negation
+   |                       help: use `!` to perform logical negation or bitwise not
 
 error: aborting due to 6 previous errors
 

src/test/ui/did_you_mean/issue-54109-and_instead_of_ampersands.stderr

@@ -4,63 +4,63 @@ error: `and` is not a logical operator
 LL |     let _ = a and b;
    |               ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:9:10
    |
 LL |     if a and b {
    |          ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:20:15
    |
 LL |     let _ = a or b;
    |               ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:22:10
    |
 LL |     if a or b {
    |          ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:30:11
    |
 LL |     if (a and b) {
    |           ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:38:11
    |
 LL |     if (a or b) {
    |           ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:46:13
    |
 LL |     while a and b {
    |             ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:54:13
    |
 LL |     while a or b {
    |             ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error[E0308]: mismatched types
   --> $DIR/issue-54109-and_instead_of_ampersands.rs:13:33

src/test/ui/did_you_mean/issue-54109-without-witness.stderr

@@ -4,63 +4,63 @@ error: `and` is not a logical operator
 LL |     let _ = a and b;
    |               ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:15:10
    |
 LL |     if a and b {
    |          ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:24:15
    |
 LL |     let _ = a or b;
    |               ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:26:10
    |
 LL |     if a or b {
    |          ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:34:11
    |
 LL |     if (a and b) {
    |           ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:42:11
    |
 LL |     if (a or b) {
    |           ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `and` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:50:13
    |
 LL |     while a and b {
    |             ^^^ help: use `&&` to perform logical conjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: `or` is not a logical operator
   --> $DIR/issue-54109-without-witness.rs:58:13
    |
 LL |     while a or b {
    |             ^^ help: use `||` to perform logical disjunction
    |
-   = note: unlike in e.g., python and PHP, `&&` and `||` are used for logical operators
+   = note: unlike in e.g., Python and PHP, `&&` and `||` are used for logical operators
 
 error: aborting due to 8 previous errors