fix "break" debugger command

Calling break(N) in the debugger triggers a panic in hlua

Example

When I run

RUST_BACKTRACE=1 cargo run debug <<EOF
print "gonna break 150"
break(150)
print "broke 150"
EOF

I'm expecting

gonna break 150

broke 150

CTRL-D

Instead, I'm getting this:

gonna break 150

thread 'main' panicked at library\core\src\panicking.rs:136:5:
attempted to leave type `&mut hlua::Lua<'_>` uninitialized, which is invalid
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/fcab24817c72ffbd6ffb66d92b7ddc0d3ee4d2f0/library\std\src\panicking.rs:597
   1: core::panicking::panic_nounwind_fmt
             at /rustc/fcab24817c72ffbd6ffb66d92b7ddc0d3ee4d2f0/library\core\src\panicking.rs:106
   2: core::panicking::panic_nounwind
             at /rustc/fcab24817c72ffbd6ffb66d92b7ddc0d3ee4d2f0/library\core\src\panicking.rs:136
   3: core::mem::uninitialized
             at /rustc/fcab24817c72ffbd6ffb66d92b7ddc0d3ee4d2f0\library\core\src\mem\mod.rs:692
   4: hlua::PushGuard<ref_mut$<hlua::Lua> >::into_inner<ref_mut$<hlua::Lua> >
             at C:\Users\diogotito\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hlua-0.4.1\src\lib.rs:228
   5: hlua::lua_functions::impl$2::push_to_lua<ref_mut$<hlua::Lua>,std::io::cursor::Cursor<ref$<slice2$<u8> > > >
             at C:\Users\diogotito\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hlua-0.4.1\src\lua_functions.rs:163
   6: hlua::lua_functions::LuaFunction<ref_mut$<hlua::Lua> >::load_from_reader<ref_mut$<hlua::Lua>,std::io::cursor::Cursor<ref$<slice2$<u8> > > >
             at C:\Users\diogotito\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hlua-0.4.1\src\lua_functions.rs:324
   7: hlua::lua_functions::LuaFunction<ref_mut$<hlua::Lua> >::load<ref_mut$<hlua::Lua> >
             at C:\Users\diogotito\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hlua-0.4.1\src\lua_functions.rs:338
   8: hlua::Lua::execute<enum2$<hlua::any::AnyHashableLuaValue> >
             at C:\Users\diogotito\.cargo\registry\src\index.crates.io-6f17d22bba15001f\hlua-0.4.1\src\lib.rs:678
   9: fpt::debugger::DebuggerTextInterface::run
             at .\fpt\src\debugger.rs:353
  10: fpt_cli::debug
             at .\fpt-cli\src\main.rs:50
  11: fpt_cli::main
             at .\fpt-cli\src\main.rs:110
  12: core::ops::function::FnOnce::call_once<enum2$<core::result::Result<tuple$<>,enum2$<rustyline::error::ReadlineError> > > (*)(),tuple$<> >
             at /rustc/fcab24817c72ffbd6ffb66d92b7ddc0d3ee4d2f0\library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread caused non-unwinding panic. aborting.
error: process didn't exit successfully: `target\debug\fpt-cli.exe debug` (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN)

pineman / fpt

fix "break" debugger command #32

Example