anchor.diff:  
   Then start the application in `gdb` and execute `run`.
   
  -[source,bash]
  +[source]
   ----
   gdb ./target/debugging-native-1.0.0-SNAPSHOT-runner
   ...
  
positive.code: We already see that `gdb` is able to tell us which method caused the crash and where it’s located in the source code.
  We can also get a backtrace of the call graph that led us to this state:
  
  [source,bash]
  ----
  (gdb) bt
  #0  com.oracle.svm.core.UnmanagedMemoryUtil::copyLongsBackward(org.graalvm.word.Pointer *, org.graalvm.word.Pointer *, org.graalvm.word.UnsignedWord *) () at com/oracle/svm/core/UnmanagedMemoryUtil.java:169
  
negative.code: To fix this we can either rerun `gdb` from the target directory or,
  run `directory target/debugging-native-1.0.0-SNAPSHOT-native-image-source-jar/sources` e.g.:
  
  [source]
  ----
  (gdb) directory target/debugging-native-1.0.0-SNAPSHOT-native-image-source-jar/sources
  Source directories searched: /data/target/debugging-native-1.0.0-SNAPSHOT-native-image-source-jar/sources:$cdir:$cwd
  