Treat the x*1 generated by parsing a unary + as containing a dot.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 43694df1132f0454452aed3b21908a4ac1bdbef5..319d468e4d61db43f529e8424139842d7bede8ba 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -626,7 +626,7 @@ Expression* ParserTraits::BuildUnaryExpression(Expression* expression,
   // Desugar '+foo' => 'foo*1'
   if (op == Token::ADD) {
     return factory->NewBinaryOperation(
-        Token::MUL, expression, factory->NewNumberLiteral(1, pos), pos);
+        Token::MUL, expression, factory->NewNumberLiteral(1, pos, true), pos);
   }
   // The same idea for '-foo' => 'foo*(-1)'.
   if (op == Token::SUB) {