Cannot compose type conversion functions like int, double, etc via >> operator

[johlrich]

Description

When using the >> operator you cannot compose functions such as int, double, etc. When you do this, fable will not generate the js Number.parseInt call. This causes a string to be passed to the next function.

As a workaround you can compose functions together without the >> operator to generate the parse call properly.

Repro code

Probably quickest to demonstrate this via the REPL. You'll notice apply does not have Number.parseInt call, but the others do.

http://fable.io/repl.html#?code=let%20apply%20%3A%20string%20-%3E%20Choice%3Cint%2C%20obj%3E%20%3D%20int%20%3E%3E%20Choice1Of2%0D%0Alet%20apply2%20%3A%20string%20-%3E%20Choice%3Cint%2C%20obj%3E%20%3D%20System.Int32.Parse%20%3E%3E%20Choice1Of2%0D%0Alet%20apply3%20%3A%20string%20-%3E%20Choice%3Cint%2C%20obj%3E%20%3D%20fun%20s%20-%3E%20int%20s%20%7C%3E%20Choice1Of2%0D%0A%0D%0A%0D%0A

Expected and actual results

Expected the string to be parsed into a number before being handed to the next function.

Actually passed the string, causing downstream fn errors at runtime.

Related information

• fable-compiler version: 908
• fable-core version: 908
• Operating system: Windows

[johlrich]

Failing test here: #799