Error Handling
Nujel uses 2 different systems for error handling, depending on the broad category that the error belongs to:
Compile time: Exceptions
Exceptions should only be used for compile time errors, they are quite handy to short circuit the reader/compiler and immediatly return an error message to the programmer. Although you can throw any kind of value, most code in the standard library by convention returns a list with a keyword, a human readable string and then maybe the symbol/region of code that led to the exception.
Runtime: Result types
Runtime errors should be signaled using the return value, either by return a different type depending on success, or by returning a pair of values, either way, a simple if statement should be enough to handle the error:
[def file-content [file/read "test.txt"]]
[if file-content
[display file-content]
[display "Error reading file!"]]