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Generic type inference failure in a union.
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.3.0-dev.20190117
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:** generic type inference, union types
**Code**
```ts
function f1<A1, B1>(cb: (a: A1, b: B1) => void) {
f2(cb); // I expect no errors
}
function f2<A2, B2>(cb: ((x: number, a: A2, b: B2) => void)|
((a: A2, b: B2) => void)) {} // If I swap the two types it compiles
```
**Expected behavior:**
No errors.
**Actual behavior:**
```
TS2345: Argument of type '(a: A1, b: B1) => void' is not assignable to parameter of type '((x: number, a: B1, b: B1) => void) | ((a: B1, b: B1) => void)'.
Type '(a: A1, b: B1) => void' is not assignable to type '(x: number, a: B1, b: B1) => void'.
Types of parameters 'a' and 'x' are incompatible.
Type 'number' is not assignable to type 'A1'.
```
**Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior -->
http://www.typescriptlang.org/play/#src=function%20f1%3CA1%2C%20B1%3E(cb%3A%20(a%3A%20A1%2C%20b%3A%20B1)%20%3D%3E%20void)%20%7B%0D%0A%20%20f2(cb)%3B%0D%0A%7D%0D%0A%0D%0Afunction%20f2%3CA2%2C%20B2%3E(cb%3A%20((x%3A%20number%2C%20a%3A%20A2%2C%20b%3A%20B2)%20%3D%3E%20void)%7C%0D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20((a%3A%20A2%2C%20b%3A%20B2)%20%3D%3E%20void))%20%7B%7D
**Rela…
接入你的 Agent 之后,它会调用 POST /api/v1/claims 带上 2367 完成认领。
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