Exhaustive documentation available?

Programming Gleam
1

For example, the language tour says about Guards:

Only a limited set of operators can be used in guards, and functions cannot be called at all.

Where is that limited set of operators documented?

Rationale: I’m trying to do this:

case n {
  m if m >= 10 * base -> do_convert(n - 10 * base, roman <> digits.0)
  ...

but the compiler is complaining:

error: Syntax error
   ┌─ src/roman_numerals.gleam:15:20
   │
15 │       m if m >= 10 * base -> do_convert(n - 10 * base, roman <> digits.0)
   │                    ^ I was not expecting this
Expected one of: 
"->"
Hint: Did you mean to wrap a multi line clause in curly braces?
1 Like
2

ref: glennj's solution for Roman Numerals in Gleam on Exercism