=== tests/cases/compiler/untypedArgumentInLambdaExpression.ts ===
declare function f(fn: (a: string) => string);
>f : Symbol(f, Decl(untypedArgumentInLambdaExpression.ts, 0, 0))
>fn : Symbol(fn, Decl(untypedArgumentInLambdaExpression.ts, 0, 19))
>a : Symbol(a, Decl(untypedArgumentInLambdaExpression.ts, 0, 24))
 
f((input): string => {
>f : Symbol(f, Decl(untypedArgumentInLambdaExpression.ts, 0, 0))
>input : Symbol(input, Decl(untypedArgumentInLambdaExpression.ts, 2, 3))

    return "." + input;
>input : Symbol(input, Decl(untypedArgumentInLambdaExpression.ts, 2, 3))

});