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As in many C-like languages, // starts a comment until the end of the line, whereas /* and */ delimit a block comment.

If a block comment is placed directly before a definition, field, or method declaration, it is considered a documentation comment. The contents of such a comment are parsed and included in the generated documentation.

// This is a line comment.
/* This is a block comment. */
struct Point {
/* the x coordinate */
uint32 x;
/* the y coordinate */
uint32 y;