Issue with immediately executed functions

[DuncanUszkay1]

Unless I'm missing something here, seems like inlining the creation of a function and calling it in this manner seems to be broken:

Here's a minimal example:

let normalFunc = (): (x:i32) => i32 => {
 let myFunc = (x: i32): i32 => {
 return 24 + x;
 }

 return myFunc;
}
assert(normalFunc()(1) == 25);

Compiler Error:

 ERROR TS2349: Cannot invoke an expression whose type lacks a call signature. Type 'closure-common-js-patterns/normalFunc' has no compatible call signatures.

assert(normalFunc()(1) == 25);