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Comments may appear anywhere where white space may appear in the configuration file. There are two kinds of comments: single-line and multi-line comments. Single-line comments start with ‘#’ or ‘//’ and continue to the end of the line:

# This is a comment
// This too is a comment

The following constructs, appearing at the start of a line are treated specially: ‘#include’, ‘#include_once’, ‘#line’, ‘# num’ (where num is a decimal number). These are described in detail in Preprocessor.

Multi-line or C-style comments start with the two characters ‘/*’ (slash, star) and continue until the first occurrence of ‘*/’ (star, slash).

Multi-line comments cannot be nested.