Comments and whitespace

Line comments
The character ‘ ’ begins a line comment, which may occur anywhere; all characters up to the end of the line are ignored. The characters ‘ ’ and ‘ ’, which denote Updoc, begin line comments if and only if they are the first non-whitespace character at the beginning of the line.

If the preceding line ended with a line continuation character, then a ‘ ’ is a syntax error.

? foo =~ bar \ > ? baz
 * 1) syntax error: ...