Utilities for working with the Exception type.

The Exception type represents an error that has occurred during computation.

from "exception" include Exception

exception ExampleError(Number)

exception ExampleError

Functions and constants included in the Exception module.

registerPrinter : (printer: (Exception => Option<String>)) => Void

Registers an exception printer. When an exception is thrown, all registered printers are called in order from the most recently registered printer to the least recently registered printer. The first Some value returned is used as the exception’s string value.

Parameters:

Examples:

exception ExampleError(Number)

Exception.registerPrinter(e => {
  match (e) {
    ExampleError(lineNumber) =>
      Some("Error found on line: " ++ toString(lineNumber)),
    _ => None,
  }
})

throw ExampleError(1) // Error found on line: 1