Uncaught SyntaxError: Invalid or unexpected token

[zdooder]

Trying to save an APEX class with a syntax error results in no error message and failure to save. Opening the browser's javascript console shows:

Uncaught SyntaxError: Invalid or unexpected token
    at Object.success (d3vCode.js?v=1.0.2:4005)
    at n (jquery.min.js?v=1.0.2:2)
    at Object.fireWith [as resolveWith] (jquery.min.js?v=1.0.2:2)
    at w (jquery.min.js?v=1.0.2:4)
    at XMLHttpRequest.d (jquery.min.js?v=1.0.2:4)

The "Network" tab of the browser's developer tools shows the actual return value from Salesforce:

{ "bodyCrc" : "","column" : "18","Id" : "","line" : "178","Name" : "AcctFinancialHistoryController","problem" : "Unrecognized symbol '"', which is not a valid Apex identifier.","success" : "false","warnings" : ""}

The actual problem in the class is that double-quotes were used around a string literal instead of single quotes. I suspect that a parser is failing to parse the error with the mixed (and unbalanced) quotation marks?

[fillip]

Yeah I believe your assessment is correct. If I combine your JSON with the line of code that is failing here (d3v.js line 4005) I came up with the following script:

var saveApexResult = `{ "bodyCrc" : "","column" : "18","Id" : "","line" : "178","Name" : "AcctFinancialHistoryController","problem" : "Unrecognized symbol '"', which is not a valid Apex identifier.","success" : "false","warnings" : ""}`;
var result = eval('(' + saveApexResult.replace(/\n/gi, '').replace(' \'"\'"', ': (\')"') + ')');

Executing this results in the same error message. It appears ive perhaps made an attempt to fix similar issues before with that interesting replace (...replace(' \'"\'"', ': (\')"') + ')')) already. If you wanted to take a stab at fixing this one and put up a pull required for it, that would be greatly appreciated.