=== tests/cases/compiler/genericInference1.ts ===
['a', 'b', 'c'].map(x => x.length);
>['a', 'b', 'c'].map : Symbol(Array.map, Decl(lib.d.ts, 1115, 92))
>map : Symbol(Array.map, Decl(lib.d.ts, 1115, 92))
>x : Symbol(x, Decl(genericInference1.ts, 0, 20))
>x.length : Symbol(String.length, Decl(lib.d.ts, 414, 19))
>x : Symbol(x, Decl(genericInference1.ts, 0, 20))
>length : Symbol(String.length, Decl(lib.d.ts, 414, 19))