Method shorthand in object literal loses method name in toString() output

[LoyDgIk]

Description

When using method shorthand syntax (c(){}) inside an object literal in Rhino, calling toString() on the method returns "(){}" (missing the method name). In contrast, the traditional function expression (b: function(){}) correctly returns "function b(){}". This behavior differs from modern JavaScript engines (e.g., V8) which output the method name ("c(){}"). The issue likely stems from incomplete ES6 support in Rhino’s function representation.

Steps to Reproduce

1. toString() output lacks the method name
   cff.c.toString() returns "(){}" instead of the expected "c(){}".
   In contrast, the traditional function expression (b: function(){}) correctly returns "function b(){}".
2. uneval() generates syntactically invalid code
   uneval(cff) returns "({c:(){}, b:function(){}})". The fragment c:(){} is not valid JavaScript syntax – it should be either c: function(){} or c(){}. Consequently, attempting to eval() this string results in a SyntaxError.

These issues arise from incomplete ES6 support in Rhino’s handling of method definitions and their serialization.

Steps to Reproduce

Run the following script in Rhino:

let cff = {
    c(){},
    b: function(){}
};
console.log(cff.c.toString());
console.log(cff.b.toString());
console.log(uneval(cff));
eval(uneval(cff));  // This will throw a SyntaxError

Expected Behavior

· cff.c.toString() → "c(){}" (or at least include the method name).
· cff.b.toString() → "function (){}".
· uneval(cff) → a valid object literal representation, for example:
· "({c(){}, b: function(){}})" (preserving shorthand syntax) or
· "({c: function(){}, b: function(){}})" (using traditional syntax).
· eval(uneval(cff)) should succeed and produce an equivalent object.

Actual Behavior

· cff.c.toString() → "(){}" (method name omitted).
· cff.b.toString() → "function (){}" (correct).
· uneval(cff) → "({c:(){}, b:function(){}})" (invalid syntax c:(){}).
· eval(uneval(cff)) → SyntaxError .

Environment

· Rhino version: 1.9.0+ (tested with 1.9.0 and later releases)
· system: android