Prefix operator +++ gives compiler warning/error

IDE: Fire
Version: Version 10.0.0.2400 (develop) built on talax, 20190429-101133. Commit 7d23006.
Target (If relevant): iOS
Description:
If you use the code prefix operator +++ the compiler is gives a compiler error. It’s appears the is a silent error and is not effecting the behaviour of the app and is not stopping compiling

Expected Behavior:
Getting a compiler warning/error when using this line:

E:                opening bracket expected, got attribute [/Users/x/Development/Projects/x/x/version-3/config-app/x/Third-Party/Form/Operators.swift (4)]

If you add {} so making the line to be prefix operator +++ {} the error disappears

Actual Behavior:
Compiling this line of code without a compiler error

Steps:
Step 1 Create app
Step 2 Add the code prefix operator +++
Step 3 Check error when compiling

Thanks, logged as bugs://82485

bugs://82485 got closed with status fixed.