=== tests/cases/compiler/indexerReturningTypeParameter1.ts ===
interface f {
>f : f, Symbol(f, Decl(indexerReturningTypeParameter1.ts, 0, 0))

    groupBy<T>(): { [key: string]: T[]; };
>groupBy : <T>() => { [key: string]: T[]; }, Symbol(groupBy, Decl(indexerReturningTypeParameter1.ts, 0, 13))
>T : T, Symbol(T, Decl(indexerReturningTypeParameter1.ts, 1, 12))
>key : string, Symbol(key, Decl(indexerReturningTypeParameter1.ts, 1, 21))
>T : T, Symbol(T, Decl(indexerReturningTypeParameter1.ts, 1, 12))
}
var a: f;
>a : f, Symbol(a, Decl(indexerReturningTypeParameter1.ts, 3, 3))
>f : f, Symbol(f, Decl(indexerReturningTypeParameter1.ts, 0, 0))

var r = a.groupBy();
>r : { [key: string]: {}[]; }, Symbol(r, Decl(indexerReturningTypeParameter1.ts, 4, 3))
>a.groupBy() : { [key: string]: {}[]; }
>a.groupBy : <T>() => { [key: string]: T[]; }, Symbol(f.groupBy, Decl(indexerReturningTypeParameter1.ts, 0, 13))
>a : f, Symbol(a, Decl(indexerReturningTypeParameter1.ts, 3, 3))
>groupBy : <T>() => { [key: string]: T[]; }, Symbol(f.groupBy, Decl(indexerReturningTypeParameter1.ts, 0, 13))

class c {
>c : c, Symbol(c, Decl(indexerReturningTypeParameter1.ts, 4, 20))

    groupBy<T>(): { [key: string]: T[]; } {
>groupBy : <T>() => { [key: string]: T[]; }, Symbol(groupBy, Decl(indexerReturningTypeParameter1.ts, 6, 9))
>T : T, Symbol(T, Decl(indexerReturningTypeParameter1.ts, 7, 12))
>key : string, Symbol(key, Decl(indexerReturningTypeParameter1.ts, 7, 21))
>T : T, Symbol(T, Decl(indexerReturningTypeParameter1.ts, 7, 12))

        return null;
>null : null
    }
}
var a2: c;
>a2 : c, Symbol(a2, Decl(indexerReturningTypeParameter1.ts, 11, 3))
>c : c, Symbol(c, Decl(indexerReturningTypeParameter1.ts, 4, 20))

var r2 = a2.groupBy();
>r2 : { [key: string]: {}[]; }, Symbol(r2, Decl(indexerReturningTypeParameter1.ts, 12, 3))
>a2.groupBy() : { [key: string]: {}[]; }
>a2.groupBy : <T>() => { [key: string]: T[]; }, Symbol(c.groupBy, Decl(indexerReturningTypeParameter1.ts, 6, 9))
>a2 : c, Symbol(a2, Decl(indexerReturningTypeParameter1.ts, 11, 3))
>groupBy : <T>() => { [key: string]: T[]; }, Symbol(c.groupBy, Decl(indexerReturningTypeParameter1.ts, 6, 9))