Line break before/after '=' in ...prototype.method = function() {... works/fails

Assume this simple Person 'class' definition with just value properties:

var Person = function(name) {
  this.name = name;
};

Compare now both of these syntactically correct Person 'method' definitions:

Definition 1:

Person.prototype.spelled = 
    function() { return this.name.split("").join(" - "); };

Definition 2:

Person.prototype.spelled 
    = function() { return this.name.split("").join(" - "); };

Why is 1 working and 2 throws the following runtime error:

Uncaught SyntaxError: Got '=' expected EOF
 at line 1 col 5
    = function() { return this.name.split('').join(' = '); }...

Has Espruino's rigid statement completion by semi-colon policy changed?