No IntelliSense for generic literal types

TypeScript Version: typescript@3.8.0-dev.20191026

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Repo
For the typescript:

function test<T extends "x" | "y">() {}

test<''>

Expected behavior:
Suggestions for x and y returned.

Actual behavior:
No suggestions returned

Note that this issue also occurs with class heritage.

type S = 'a' | 'b' | 'c';

abstract class C<T extends S> {}

class ImplC extends C<''> {} // try autocomplete in the ''

But it works fine with variables.

type S = 'a' | 'b' | 'c';

type G<E extends S> = Readonly<E>;

let a: G<''>;  // autocomplete works fine here

Is the fact that the cursor is within a string literal crucial to this issue, or would you also consider this a reproduction?

function test<T extends 1 | 2 | 3>() {}
test</* trigger completions here */>()

I'm trying to determine if/how this differs from #52898.

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