Printer fails when encountering RegularExpressionLiteral

[fwouts]

TypeScript Version: 2.4.2

Code

import * as ts from "typescript";
let sourceCode = "let a = /regexp/";
let tsSourceFile = ts.createSourceFile(
  "script.js",
  sourceCode,
  ts.ScriptTarget.Latest
);
console.log(
  ts.createPrinter().printFile(tsSourceFile)
);

Expected behavior:
The script should output let a = /regexp/;

Actual behavior:
The script crashes with the following stack trace:

.../node_modules/typescript/lib/typescript.js:3495
            throw e;
            ^
Error: Debug Failure.
    at Object.getLiteralText (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:7077:18)
    at getLiteralTextOfNode (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:68597:23)
    at emitLiteral (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:66918:24)
    at pipelineEmitExpression (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:66816:28)
    at pipelineEmitWithHint (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:66565:49)
    at pipelineEmitWithSourceMap (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:66558:17)
    at emitNodeWithNestedComments (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:64324:17)
    at emitNodeWithSynthesizedComments (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:64274:13)
    at emitNodeWithComments (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:64244:21)
    at pipelineEmitWithComments (/Users/work/GitHub/sample-js-selfparsing/node_modules/typescript/lib/typescript.js:66547:17)
error Command failed with exit code 1.

Proposed fix:
fwouts@884cadf

Where would be a good place to add tests for this?

[ikatyang]

https://github.com/Microsoft/TypeScript/blob/master/src/harness/unittests/printer.ts

[fwouts]

Thanks @ikatyang, I've added a test in fwouts@170bc6f.

Happy to send a PR once the Community milestone is added to this issue.

[DanielRosenwasser]

Go for it! Thanks for looking into this @fwouts and being mindful of the triage process.

@ikatyang, thanks for helping @fwouts out. 😃