This is the julia debugger. Please note that the 0.6 version of this package currently does not support breakpointing, C/C++ debugging or native code inspection. These features are being rebuilt, but were never particularly reliable in prior versions of this package and a cause of instability for the more mature features. In exchange, this package features a signficantly more robust pure julia debug prompt, provided by ASTInterpreter2. Please file interpreter issues against that package.
using Gallium @enter gcd(10, 20)
help at the debug prompt to see a list of available commands.