Improve error when parameter is missing a name

TypeScript Version: 2.8.0-dev.20180227
Code

declare class C {
    f({ x?: number }): void;
    g(): void;
}

Expected behavior:

At the ?, property in destructuring may not be marked optional.

Actual behavior:

src/a.ts(2,10): error TS1005: ',' expected.
src/a.ts(2,20): error TS1005: ',' expected.
src/a.ts(2,21): error TS1128: Declaration or statement expected.
src/a.ts(2,22): error TS1128: Declaration or statement expected.
src/a.ts(2,28): error TS1109: Expression expected.
src/a.ts(3,8): error TS1005: ';' expected.
src/a.ts(3,14): error TS1109: Expression expected.
src/a.ts(4,1): error TS1128: Declaration or statement expected.

首先编译提供的 TypeScript 代码片段，并将诊断位置和措辞与预期消息进行比较。由于 issue 中没有指定源文件或测试，请跟踪处理解构参数中可选属性的编译器路径。完成的标准是：在 ? 处报告目标错误，而不是报告一连串的解析错误。