In druntime (core/bitop.d line 302) I found this function
``` /** * Tests and resets (sets to 0) the bit. */ int btr(size_t* p, size_t bitnum) pure @system; ``` Honestly don't understand: where is the body of the function? I thought I could find something like that: ``` int btr(size_t* p, size_t bitnum) pure @system { // body } Thank you