Lexical structure

Kirn source files use the .kn extension. Whitespace is not significant; blocks use braces and simple statements normally end with semicolons.

Identifiers

Identifiers begin with a letter or underscore and may contain numbers after the first character.

user_name = "kirn";
_count = 1;

Comments

A comment begins with # and continues to the end of the line.

# This is a comment.
value = 42;

Keywords

The lexer currently recognizes keywords including fn, var, if, elif, else, while, for, in, return, match, struct, enum, trait, impl, import, export, pub, spawn, chan, select, try, catch, unsafe, extern, class, interface, record, and extends.

The authoritative list is src/lex/lexer.cpp; syntax is specified in grammar/kirn.ebnf.