Macro debug_here

macro_rules! debug_here {
    () => { ... };
    ( gdb ) => { ... };
    ( lldb ) => { ... };
}

The debug here macro. Just invoke this macro somewhere in your source, and when your program reaches it a terminal running rust-gdb or rust-lldb will launch.

If you want to force a specific debugger backend, you can write debug_here!(gdb) or debug_here!(lldb).