mandoc: warn.in:10:8: WARNING: parenthesis in function name: sin()
mandoc: warn.in:14:19: WARNING: comma in function argument: double y, double x
mandoc: warn.in:16:10: WARNING: parenthesis in function name: close)
mandoc: warn.in:22:5: WARNING: parenthesis in function name: (open
mandoc: warn.in:24:5: WARNING: parenthesis in function name: (*popen
mandoc: warn.in:26:5: WARNING: parenthesis in function name: (trail)x