frame #9: 0x00000001000095d1 dom-rooting`dom_rooting::parse_callgraph_call::he390b4fd9cb48a86(line="D 1 2") at main.rs:84 81 let m = RE.captures(line) 82 .expect(&format!("parse failure: {:?}", line)); 83 -> 84 return (m[1].parse().unwrap(), m[2].parse().unwrap()); 85	} 86 87	fn parse_callgraph(p: &Path) -> Callgraph { 

(lldb) p m Traceback (most recent call last): File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 99, in print_val is_tuple_like = False) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val is_tuple_like = True) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val return print_std_vec_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values return ', '.join([render_element(i) for i in range(length)]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element return print_val(element_val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val is_tuple_like = True) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val return print_str_slice_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val return read_utf8_string(data_ptr, length) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string data = process.ReadMemory(ptr_val.as_integer(), byte_count, error) File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory return _lldb.SBProcess_ReadMemory(self, *args) ValueError: Positive integer expected Traceback (most recent call last): File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val is_tuple_like = True) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val return print_std_vec_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values return ', '.join([render_element(i) for i in range(length)]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element return print_val(element_val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val is_tuple_like = True) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val return print_str_slice_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val return read_utf8_string(data_ptr, length) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string data = process.ReadMemory(ptr_val.as_integer(), byte_count, error) File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory return _lldb.SBProcess_ReadMemory(self, *args) ValueError: Positive integer expected Traceback (most recent call last): File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 115, in print_val return print_std_vec_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 264, in print_std_vec_val internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 299, in print_array_of_values return ', '.join([render_element(i) for i in range(length)]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 297, in render_element return print_val(element_val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 156, in print_val return print_val(lldb_val.GetChildAtIndex(discriminant_val), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 132, in print_val is_tuple_like = True) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 220, in print_struct_val body = separator.join([render_child(idx) for idx in range(field_start_index, len(fields))]) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 213, in render_child return this + print_val(field_val.get_wrapped_value(), internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 112, in print_val return print_str_slice_val(val, internal_dict) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 268, in print_str_slice_val return read_utf8_string(data_ptr, length) File "/Users/agaynor/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/etc/lldb_rust_formatters.py", line 305, in read_utf8_string data = process.ReadMemory(ptr_val.as_integer(), byte_count, error) File "/Applications/Xcode.app/Contents/SharedFrameworks/LLDB.framework/Resources/Python/lldb/__init__.py", line 7184, in ReadMemory return _lldb.SBProcess_ReadMemory(self, *args) ValueError: Positive integer expected (regex::re_unicode::Captures) $3 = { text = "D 1 2" locs = { __0 = { buf = RawVec<core::option::Option<usize>, alloc::alloc::Global> { ptr: Unique<core::option::Option<usize>> { pointer: NonZero<*const core::option::Option<usize>>(&0x10288d280), _marker: PhantomData<core::option::Option<usize>> }, cap: 8, a: Global } len = 8 } } named_groups = Arc<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>> { ptr: NonNull<alloc::arc::ArcInner<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>>> { pointer: NonZero<*const alloc::arc::ArcInner<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>>>(&0x10288c500) }, phantom: PhantomData<std::collections::hash::map::HashMap<alloc::string::String, usize, std::collections::hash::map::RandomState>> } } (lldb) 

~/p/h/dom-rooting ❯❯❯ rust-lldb --version lldb-900.0.57 Swift-4.0 ~/p/h/dom-rooting ❯❯❯ rustc --version rustc 1.27.0 (3eda71b00 2018-06-19) ~/p/h/dom-rooting ❯❯❯ sw_vers ProductName:	Mac OS X ProductVersion:	10.13.5 BuildVersion:	17F77