[ALOY-1637] ES6 code frame fails when using duplicate variable declarations

When using ES6 constants and accidentially redeclaring them like in the following example: {code.js} const test = ''; const test = 'hello';

the build fails like expected, but the error is hidden by a parsing error inside our code-frame / ES6 transform handling:

[DEBUG] /usr/local/lib/node_modules/alloy/Alloy/commands/compile/ast/controller.js:66 [DEBUG] U.dieWithCodeFrame('Error generating AST for "' + file + '". Unexpected token at line ' + e.loc.line + ' column ' + e.loc.column, e.loc, code); [DEBUG] ^ [DEBUG] TypeError: Cannot read property 'line' of undefined [DEBUG] at Object.exports.processController (/usr/local/lib/node_modules/alloy/Alloy/commands/compile/ast/controller.js:66:99) [DEBUG] at Object.exports.loadController (/usr/local/lib/node_modules/alloy/Alloy/commands/compile/compilerUtils.js:929:33) [DEBUG] at parseAlloyComponent (/usr/local/lib/node_modules/alloy/Alloy/commands/compile/index.js:833:17) ``` This is no critical error, but reaaally hard to track if never happened before. I hope this JIRA also helps some people tracking it down more easily.