i.e. can a bug that existed early in the toolchain history propagate in the binaries but not the sources? c_i is the i'th version of the compiler. c1 c2 /

i.e. can a bug that existed early in the toolchain history propagate in the binaries but not the sources? c_i is the i'th version of the compiler. c1 c2 // c1 compiles c2 c2 c3 // c2 compiles c3 Source code of c1 has bug, source code of c2 and c3 is fixed. Bug in c1 causes binary of c2 to have bug. Binary bug in c2 causes binary bug in c3.