Migrating BindingTraceContext to a transactional form

grammar/src/class_members.grm

@@ -119,7 +119,7 @@ parameter
   ;
 
 object
-  : "object" SimpleName ":" delegationSpecifier{","}? classBody? // Class body can be optional: this is a declaration
+  : "object" SimpleName (":" delegationSpecifier{","})? classBody? // Class body can be optional: this is a declaration
 /**
 bq. See [Object expressions and Declarations]
 */

grammar/src/expressions.grm

@@ -235,7 +235,7 @@ jump
 // Ambiguity when after a SimpleName (infix call). In this case (e) is treated as an expression in parentheses
 // to put a tuple, write write ((e))
 tupleLiteral
-  : "(" ((SimpleName "=")? expression){","} ")"
+  : "(" (((SimpleName "=")? expression){","})? ")"
   ;
 
 // one can use "it" as a parameter name

grammar/src/when.grm

@@ -45,7 +45,7 @@ constantPattern
   ;
 
 tuplePattern
-  : "(" ((SimpleName "=")? pattern{","})? ")"
+  : "(" (((SimpleName "=")? pattern){","})? ")"
   ;
 
 bindingPattern