Parser rejects definite assignment assertions on private instance fields #3645

class C {
    #value!: number;
    read() { return this.#value; }
}

TypeScript 6.0.3 accepts this with --ignoreConfig --strict --target ES2022 --noEmit. SharpTS reports Expect ';' after private field declaration. with --no-tsconfig --strict --noEmit before type checking.

The private-field parser does not consume a definite assignment assertion. This prevents the valid instance-field form; the static private form should instead reach the checker's TS1255 grammar diagnostic.

Found while adding static definite assignment assertion regressions for #3635.