Replace `ast::TokenKind::BinOp{,Eq}` and remove `BinOpToken`.

`BinOpToken` is badly named, because it only covers the assignable
binary ops and excludes comparisons and `&&`/`||`. Its use in
`ast::TokenKind` does allow a small amount of code sharing, but it's a
clumsy factoring.

This commit removes `ast::TokenKind::BinOp{,Eq}`, replacing each one
with 10 individual variants. This makes `ast::TokenKind` more similar to
`rustc_lexer::TokenKind`, which has individual variants for all
operators.

Although the number of lines of code increases, the number of chars
decreases due to the frequent use of shorter names like `token::Plus`
instead of `token::BinOp(BinOpToken::Plus)`.

1 files changed, 16 insertions, 20 deletions

diff --git a/compiler/rustc_parse/src/parser/expr.rs b/compiler/rustc_parse/src/parser/expr.rs
index ef29ac2719d..a991ad14bc8 100644
--- a/compiler/rustc_parse/src/parser/expr.rs
+++ b/compiler/rustc_parse/src/parser/expr.rs
@@ -239,8 +239,8 @@ impl<'a> Parser<'a> {
                 self.bump();
             }
 
-            if self.prev_token == token::BinOp(token::Plus)
-                && self.token == token::BinOp(token::Plus)
+            if self.prev_token == token::Plus
+                && self.token == token::Plus
                 && self.prev_token.span.between(self.token.span).is_empty()
             {
                 let op_span = self.prev_token.span.to(self.token.span);
@@ -250,8 +250,8 @@ impl<'a> Parser<'a> {
                 continue;
             }
 
-            if self.prev_token == token::BinOp(token::Minus)
-                && self.token == token::BinOp(token::Minus)
+            if self.prev_token == token::Minus
+                && self.token == token::Minus
                 && self.prev_token.span.between(self.token.span).is_empty()
                 && !self.look_ahead(1, |tok| tok.can_begin_expr())
             {
@@ -509,19 +509,19 @@ impl<'a> Parser<'a> {
             // `~expr`
             token::Tilde => make_it!(this, attrs, |this, _| this.recover_tilde_expr(lo)),
             // `-expr`
-            token::BinOp(token::Minus) => {
+            token::Minus => {
                 make_it!(this, attrs, |this, _| this.parse_expr_unary(lo, UnOp::Neg))
             }
             // `*expr`
-            token::BinOp(token::Star) => {
+            token::Star => {
                 make_it!(this, attrs, |this, _| this.parse_expr_unary(lo, UnOp::Deref))
             }
             // `&expr` and `&&expr`
-            token::BinOp(token::And) | token::AndAnd => {
+            token::And | token::AndAnd => {
                 make_it!(this, attrs, |this, _| this.parse_expr_borrow(lo))
             }
             // `+lit`
-            token::BinOp(token::Plus) if this.look_ahead(1, |tok| tok.is_numeric_lit()) => {
+            token::Plus if this.look_ahead(1, |tok| tok.is_numeric_lit()) => {
                 let mut err = errors::LeadingPlusNotSupported {
                     span: lo,
                     remove_plus: None,
@@ -541,9 +541,7 @@ impl<'a> Parser<'a> {
                 this.parse_expr_prefix(attrs)
             }
             // Recover from `++x`:
-            token::BinOp(token::Plus)
-                if this.look_ahead(1, |t| *t == token::BinOp(token::Plus)) =>
-            {
+            token::Plus if this.look_ahead(1, |t| *t == token::Plus) => {
                 let starts_stmt = this.prev_token == token::Semi
                     || this.prev_token == token::CloseDelim(Delimiter::Brace);
                 let pre_span = this.token.span.to(this.look_ahead(1, |t| t.span));
@@ -723,14 +721,12 @@ impl<'a> Parser<'a> {
                                     suggestion,
                                 })
                             }
-                            token::BinOp(token::Shl) => {
-                                self.dcx().emit_err(errors::ShiftInterpretedAsGeneric {
-                                    shift: self.token.span,
-                                    r#type: path,
-                                    args: args_span,
-                                    suggestion,
-                                })
-                            }
+                            token::Shl => self.dcx().emit_err(errors::ShiftInterpretedAsGeneric {
+                                shift: self.token.span,
+                                r#type: path,
+                                args: args_span,
+                                suggestion,
+                            }),
                             _ => {
                                 // We can end up here even without `<` being the next token, for
                                 // example because `parse_ty_no_plus` returns `Err` on keywords,
@@ -2595,7 +2591,7 @@ impl<'a> Parser<'a> {
                 missing_let: None,
                 comparison: None,
             };
-            if self.prev_token == token::BinOp(token::Or) {
+            if self.prev_token == token::Or {
                 // This was part of a closure, the that part of the parser recover.
                 return Err(self.dcx().create_err(err));
             } else {