Compiler crashes when comparing functions

[t4ccer]

What Git revision are you using?

Compiled from source at 075668b

$ aiken --version
aiken v1.0.26-alpha+unknown

What operating system are you using, and which version?

• Linux / Ubuntu
• Linux / Other
• macOS
• Windows

Describe what the problem is?

fn not(x: Bool) -> Bool {
   when x is {
     False -> True
     True -> False
   }
}

fn foo() -> Bool {
   not == not
}

When using foo() anywhere in validator code, the compiler crashes.

   aiken::fatal::error
   Whoops! You found a bug in the Aiken compiler.
   
   Please report this error at https://github.com/aiken-lang/aiken/issues/new.
   In your bug report please provide the information below and if possible the code
   that produced it.
   
   Operating System: linux
   Architecture:     x86_64
   Version:          v1.0.26-alpha+unknown
   
   crates/aiken-lang/src/gen_uplc.rs:4193:77
   
       called `Result::unwrap()` on an `Err` value: NotAConstant(Lambda <a lot of uplc>)

What should be the expected behavior?

Type checker should not allow for comparing functions