c_gtk_radio_button_new_with_label_from_widget

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GtkWidget* function(GtkRadioButton* radioGroupMember, const(char)* label) c_gtk_radio_button_new_with_label_from_widget;

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