ZoKrates

Inline (single-line) comments allow narrative on only one line at a time. Single-line comments can begin in any column of a given line and end at a new line or carriage return. Inline comments can be added with double-slashes.

def main() -> field {
    field a = 42; // this is an end of line comment
    // this is a full line comment
    return a;
}

Multi-line comments have one or more lines of narrative within a set of comment delimiters. The /* delimiter marks the beginning of the comment, and the */ marks the end. Any content between those delimiters is considered a comment.

/*
    This is a multi-line comment
    written in more than just one line.
*/
def main() -> field {
    return 42;
}