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Debug Line

Use of D or d as the first character (column 1) of a source line denotes a debug line.

In turn, a debug line is treated as either a comment line or a normal line, depending on whether debug lines are enabled.

When treated as a comment line, a line beginning with D or d is treated as if it the first character was C or c, respectively. When treated as a normal line, such a line is treated as if the first character was <SPC> (space).

(Currently, g77 provides no means for treating debug lines as normal lines.)