==== tests/cases/compiler/duplicateStringNamedProperty1.ts (1 errors) ====
    export interface Album {
        "artist": string;
        artist: string;
        ~~~~~~
!!! duplicateStringNamedProperty1.ts(3,5): error TS2000: Duplicate identifier 'artist'. Additional locations:
!!! 	duplicateStringNamedProperty1.ts(2,5)
    }