Unknown property key type: StringLiteral

node parser.js ../../Protobuf/ast.proto code.js output.ast.proto

code.js:

x = { "": 0 }

Tested on rev d42d6fa0a.

<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:393
                                throw "Unknown property key type: " + field.key.type;
                                ^
Unknown property key type: StringLiteral
Thrown at:
    at visitExpression (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:393:33)
    at visitExpression (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:375:27)
    at visitStatement (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:119:28)
    at visitProgram (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:51:37)
    at parse (<repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:561:12)
    at <repo>/Sources/Fuzzilli/Compiler/Parser/parser.js:570:15
    at finish (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:105:9)
    at process (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:143:13)
    at <repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/protobufjs/src/root.js:195:17
    at fetchReadFileCallback (<repo>/Sources/Fuzzilli/Compiler/Parser/node_modules/@protobufjs/fetch/index.js:51:19)

Start with Sources/Fuzzilli/Compiler/Parser/parser.js at line 393 and reproduce the failure using the issue's parser.js command and code.js example. Check how the parser handles the object property key, then verify that the example no longer raises the unknown property key type error.