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Correlated type constraint breaks under return type inference
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.5.1
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
return type, generic, constraint, assignable, correlated type
**Code**
```ts
type XStr = {x:string};
type XNum = {x:number};
type U = XStr|XNum;
type Args = { str : XStr, num : XNum };
declare function foo<
ReturnT extends U,
ValueT extends ReturnT["x"]
> (
f : (args : Args) => ReturnT,
value : ValueT
) : void;
/*
Error as expected.
Type 'string | number' does not satisfy the constraint 'string'.
Type 'number' is not assignable to type 'string'.
*/
foo<XStr, string|number>(
(args:Args) => args.str,
""
);
//Inferred type, foo<XStr, string | number>
foo(
args => args.str,
//Expected: Error
//Actual: OK
"" as string|number
);
//Inferred type, foo<XStr, string>
foo(
//Added explicit type annotation to function params
(args:Args) => args.str,
/*
Error as expected.
Type 'string | number' does not satisfy the constraint 'string'.
Type 'number' is not assignable to type 'string'.
*/
"" as string|number
);
/////
/*
Error as expected.
Type '1' does not satisfy the constraint 'string'.
*/
foo<XStr, 1>(
(args:Args) => args.str,
1
);
//Inferred type, foo<XStr, 1>
foo(
args => args.str,
//Expected: Error
…
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