https://invisible-island.net/xterm/xtoolkit/
XtStringConversionWarning - issue a conversion warning message
#include <X11/Intrinsic.h> void XtStringConversionWarning(const char *src, const char *dst_type);
src Specifies the string that could not be converted. dst_type Specifies the name of the type to which the string could not be converted.
The XtStringConversionWarning function issues a warning message with name "conversionError", type "string", class "XtToolkitError", and the default message string "Cannot convert "src" to type dst_type". XtStringConversionWarning has been replaced by XtDisplayStringConver- sionWarning.
XtAppAddConverter(3), XtAppErrorMsg(3t), XtConvert(3), XtDisplayString- ConversionWarning(3) X Toolkit Intrinsics – C Language Interface Xlib - C Language X Interface X Version 11 libXt 1.1.5.2 XtStringConversionWarning(3)