extract parse_neg_expr

Author: Centril

src/librustc_parse/parser/expr.rs

@@ -469,12 +469,7 @@ impl<'a> Parser<'a> {
                     .emit();
                 (lo.to(span), self.mk_unary(UnOp::Not, e))
             }
-            token::BinOp(token::Minus) => {
-                self.bump();
-                let e = self.parse_prefix_expr(None);
-                let (span, e) = self.interpolated_or_expr_span(e)?;
-                (lo.to(span), self.mk_unary(UnOp::Neg, e))
-            }
+            token::BinOp(token::Minus) => self.parse_neg_expr(lo)?,
             token::BinOp(token::Star) => self.parse_deref_expr(lo)?,
             token::BinOp(token::And) | token::AndAnd => self.parse_borrow_expr(lo)?,
             token::Ident(..) if self.token.is_keyword(kw::Box) => self.parse_box_expr(lo)?,
@@ -486,6 +481,14 @@ impl<'a> Parser<'a> {
         return Ok(self.mk_expr(lo.to(hi), ex, attrs));
     }
 
+    /// Parse `-expr`.
+    fn parse_neg_expr(&mut self, lo: Span) -> PResult<'a, (Span, ExprKind)> {
+        self.bump(); // `-`
+        let expr = self.parse_prefix_expr(None);
+        let (span, expr) = self.interpolated_or_expr_span(expr)?;
+        Ok((lo.to(span), self.mk_unary(UnOp::Neg, expr)))
+    }
+
     /// Parse `*expr`.
     fn parse_deref_expr(&mut self, lo: Span) -> PResult<'a, (Span, ExprKind)> {
         self.bump(); // `*`