[gcc/devel/rust/master] gccrs: Minor tuning in AST dump

[gcc/devel/rust/master] gccrs: Minor tuning in AST dump

[Thomas Schwinge]

https://gcc.gnu.org/g:d2df050bd4392119adf64d0e35670c1a85d6451b

commit d2df050bd4392119adf64d0e35670c1a85d6451b
Author: Marc Poulhiès <dkm@kataplop.net>
Date:   Wed Apr 26 23:08:30 2023 +0200

    gccrs: Minor tuning in AST dump
    
    Use parentheses to remove any ambiguities when dumping expressions with
    unary ! and -.
    
    gcc/rust/ChangeLog:
            * ast/rust-ast-dump.cc (Dump::visit): print parentheses around
            unique expression operand.
    
    Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

Diff:
---
 gcc/rust/ast/rust-ast-dump.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/rust/ast/rust-ast-dump.cc b/gcc/rust/ast/rust-ast-dump.cc
index c5c3300dbf9..4c1f3d85b11 100644
--- a/gcc/rust/ast/rust-ast-dump.cc
+++ b/gcc/rust/ast/rust-ast-dump.cc
@@ -554,13 +554,14 @@ Dump::visit (NegationExpr &expr)
   switch (expr.get_expr_type ())
     {
     case NegationOperator::NEGATE:
-      stream << '-';
+      stream << "-(";
       break;
     case NegationOperator::NOT:
-      stream << '!';
+      stream << "!(";
       break;
     }
   visit (expr.get_negated_expr ());
+  stream << ')';
 }
 
 void