tests/cases/compiler/typeParameterDiamond2.ts(8,13): error TS2322: Type 'T | U' is not assignable to type 'Top'.
  'Top' could be instantiated with an arbitrary type which could be unrelated to 'T | U'.
tests/cases/compiler/typeParameterDiamond2.ts(10,13): error TS2322: Type 'Bottom' is not assignable to type 'Top'.
  'Top' could be instantiated with an arbitrary type which could be unrelated to 'Bottom'.


==== tests/cases/compiler/typeParameterDiamond2.ts (2 errors) ====
    function diamondTop<Top>() {
        function diamondMiddle<T extends Top, U>() {
            function diamondBottom<Bottom extends T | U>() {
                var top: Top;
                var middle: T | U;
                var bottom: Bottom;
    
                top = middle;
                ~~~
!!! error TS2322: Type 'T | U' is not assignable to type 'Top'.
!!! error TS2322:   'Top' could be instantiated with an arbitrary type which could be unrelated to 'T | U'.
!!! related TS2208 tests/cases/compiler/typeParameterDiamond2.ts:2:43: This type parameter might need an `extends Top` constraint.
                middle = bottom;
                top = bottom;
                ~~~
!!! error TS2322: Type 'Bottom' is not assignable to type 'Top'.
!!! error TS2322:   'Top' could be instantiated with an arbitrary type which could be unrelated to 'Bottom'.
            }
        }
    }