tests/cases/compiler/uniqueSymbolAllowsIndexInObjectWithIndexSignature.ts(10,13): error TS2418: Type of computed property's value is '"str"', which is not assignable to type '"sym"'.


==== tests/cases/compiler/uniqueSymbolAllowsIndexInObjectWithIndexSignature.ts (1 errors) ====
    // https://github.com/Microsoft/TypeScript/issues/21962
    export const SYM = Symbol('a unique symbol');
    
    export interface I {
      [SYM]: 'sym';
      [x: string]: 'str';
    }
    
    let a: I = {[SYM]: 'sym'}; // Expect ok
    let b: I = {[SYM]: 'str'}; // Expect error
                ~~~~~
!!! error TS2418: Type of computed property's value is '"str"', which is not assignable to type '"sym"'.
!!! related TS6500 tests/cases/compiler/uniqueSymbolAllowsIndexInObjectWithIndexSignature.ts:5:3: The expected type comes from property 'unique symbol' which is declared here on type 'I'
    