Type coercion regression in V11

[mxthevs]

Consider the following snippet:

let _ = ("a" :> int)

In rescript@10.1.2, trying to compile this piece of code will result in the following error:

Type string is not a subtype of int 

However, in rescript@11.0.0, the compiler will exit with a Not_found exception, not showing the real error message.

Repro:

v10.1.2: https://rescript-lang.org/try?version=v10.1.2&code=DYUwLgBA+hC8EAoBEBDJEBcA+CBLAdmAJQBQQA
v11.0.0: https://rescript-lang.org/try?version=v11.0.0&code=DYUwLgBA+hC8EAoBEBDJEBcA+CBLAdmAJQBQQA

[zth]

Closed in #6574