Contributing to Rust, Office Hours 2022-12-28 and 2023-01-04

These are some office hours that pnkfelix ran as a follow-up to the "Contributing to Rust: Emit, Unpretty, Dump; Oh MIR" video, https://www.youtube.com/watch?v=H97PG2P2AiY I'm still learning what is the best process to use for capturing these office hours sessions, so please with some wonkiness in the audio/video sync. You can see notes from the session here: https://hackmd.io/tUkIP-xUQo2kqpXP_gq0TA 00:00: 2022-12-28, Any questions? 16:25: `rr record` unpretty example 35:30: Where unpretty is processed 40:36: Archaeology: why was unpretty=hir,typed aborting on error? 53:19: `rr replay` with gdb TUI mode 1:03:18: Archaelogy: why was unpretty=thir-tree aborting on error? 1:10:10: What does print_with_analysis do 1:13:42: Identifying the fix 1:16:26: Trying out the fixed `rustc`: We get thir-tree output! 1:17:16: A *long* exercise: manually translating thir-tree into pseudo-source 1:43:25: 2023-01-04, Any questions? 2:00:00: Yet another pernos.co demo 2:03:57: pernos.co built-in printing facilities (aka how to add println's to an existing trace) 2:12:40: Understanding the internal representation of compiler IR's 2:22:11: Potential future work in explaining/printing THIR 2:27:10: THIR blocks: expression/destruction scopes 2:29:30: THIR blocks: statements + tail expression; indices vs pointers 2:36:20: More common identifiers, e.g. DefId's 2:45:45: Exploring Rust's representation of types 2:50:32: What about rust-analyzer's representation of types? 3:02:27: Plans for next "Contributing to Rust" video?