The optional "Arguments" in "MemberExpression : new super Arguments{opt}" leads to three shift/reduce conflicts.
> bison --report=all super.y
super.y: Conflicts: 3 Shift/Reduce
super.y:
---
%start leftHandSideExpression
%error-verbose
%token SUPER "super"
%token NEW "new"
%token NUMBER
%token ID
%%
leftHandSideExpression : newExpression
| callExpression
;
arguments : '(' ')' ;
callExpression : memberExpression arguments
| SUPER arguments
| callExpression arguments
| callExpression '[' expression ']'
| callExpression '.' identifierName
| callExpression templateLiteral
;
newExpression : memberExpression
| NEW newExpression
;
memberExpression : primaryExpression
| memberExpression '[' expression ']'
| memberExpression '.' identifierName
| memberExpression templateLiteral
| SUPER '[' expression ']'
| SUPER '.' identifierName
| NEW SUPER arguments
| NEW SUPER
| NEW memberExpression arguments
;
templateLiteral : '`' '`' ;
expression : leftHandSideExpression ;
primaryExpression : NUMBER ;
identifierName : ID ;
%%
---
fixed in rev23 editor's draft
added a 'super' lookahead restriction for
MemberExpression :
'new' MemberExpression Arguments
fixed in rev23 draft