e031: FFI Deep Dive

A story and a dream (and the promise of Rust): the final episode of New Rustacean! Show Notes Rust by Example Winning Slowly Mass Affection buttondown.email/rewrite patreon.com/chriskrycho Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Freeman P. Pascal Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich JockeTF Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Kyle Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Romain Chossart Ryan Blecher Ryan Osial Satoshi Yoshikawa Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Sven Huster Tim Brooks Tim Small Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Contact New Rustacean: Twitter: @newrustacean Email: [email protected] Chris Krycho GitHub: chriskrycho Twitter: @chriskrycho

WASI, Option::copied, and the future of async/await syntax! Show Notes Rust 1.34.1 release notes blog post discussion about Error::type_id Rust 1.34.2 release notes blog post discussion about Error::type_id Rust 1.35 release notes blog post WASI The Bike Shed episode Async/await std::futures API docs internal thread on syntax for .await Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Freeman P. Pascal Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich JockeTF Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Kyle Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Romain Chossart Ryan Blecher Ryan Osial Satoshi Yoshikawa Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Sven Huster Tim Brooks Tim Small Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: Twitter: @newrustacean Email: [email protected] Chris Krycho GitHub: chriskrycho Twitter: @chriskrycho

Automatic generation of FFI types between Rust and C APIs. Show Notes bindgen the official guide API docs cbindgen a blog post by one of the main authors of the crate rust-ffi Binding libraries for scripting languages PyO3 Neon Rustler a great write-up from the folks at Discord Helix Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Freeman P. Pascal Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich JockeTF Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Kyle Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Romain Chossart Ryan Blecher Ryan Osial Satoshi Yoshikawa Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Sven Huster Tim Brooks Tim Small Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: Twitter: @newrustacean Email: [email protected] Chris Krycho GitHub: chriskrycho Twitter: @chriskrycho

Exposing Rust types and functions to C API consumers. Show Notes It’s impossible to make the declarations below follow the order I talked through them on the recording without also making them horrible to read, so just use this outline instead: add_in_rust Strings concat_strings free_rust_string Point point_translate union OpaquePoint opaque_point_new opaque_point_translate opaque_point_free Links Rust FFI Omnibus the repository for the show RFC #2195 Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich JockeTF Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Romain Chossart Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: Twitter: @newrustacean Email: [email protected] Chris Krycho GitHub: chriskrycho Twitter: @chriskrycho

Item visibility and pub(<restricted>) as API design tools. Show Notes The easiest and most effective way to understand the example in this case will simply be to look directly at the source code. You can read the docs for each of the nested modules, but you’ll be doing a lot of navigating around for that. Also, I am using Cargo’s --document-private-items flag, so that you can see all the items in all the modules, even those which are not public, but note that usually you would not see docs for those! Links the reference on visibility RFC #1422 episode source code e020 Sponsors Thanks to Manning for sponsoring the show and giving all of you a 40%-off discount on their whole store (but especially their WebAssembly in Action MEAP) at deals.manning.com/new-rustacean! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich JockeTF Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Romain Chossart Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho

Moar const fn, some Pin, and alternative Cargo registries! Show Notes 1.33 release notes Pin RFC API docs 1.34 release notes Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Cristian Paul Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Dominic Cooney Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jeff May Jendrik Illner Jerome Froelich Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg William Roe Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho

Using Rust’s Foreign Function Interface (FFI) with C! Show Notes The code samples here directly match the things I described in the show, so you will likely want to look at add and ffi::add, then Point, translate, and ffi::translate in that order. Links Other helpful Rust FFI discussions: The Rust Programming Language’s materials the nomicon Rust FFI Omnibus the Reference’s discussion the associated Rust API docs Sponsors Thanks to Manning for sponsoring the show and giving all of you a 40%-off discount on their whole store (but especially Carol Nichols’ and Jake Goulding’s Rust in Motion video content and the Rust in Action MEAP!) at deals.manning.com/new-rustacean Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jendrik Illner Jerome Froelich Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg William Roe Zak van der Merwe Zachary Snyder Zach Peters Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho

How I make the show, and why you won’t find it on Google Play, Spotify, or Stitcher. Show Notes Winning Slowly guest lectures on podcasting: A, B Audio recording/editing/production software: Icecast Rogue Amoeba Audio Hijack Loopback Ferrite iZotope RX previous episodes of interest building a markdown link extractor using rustdoc Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Arun Kulshreshtha [beaorn] Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Doug Reeves Douglas Correa Edmund Kump Eduard Knyshov Embark Studios Eugene Bulkin Evan Stoll Fabio (decathorpe) Fabio Correa Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu Hugo Josefson “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jendrik Illner Jerome Froelich Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Oladapo Fadeyi Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg William Roe Zak van der Merwe Zachary Snyder Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho

A story about parsing command-line arguments manually and some thoughts on “rookie mistakes.” Show Notes why you might want to invoke the same program with different names Python’s argparse library Commander in Node clap structopt pulldown-cmark Sponsors Thanks to Parity for sponsoring the show and hiring Rust developers! Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Doug Reeves Douglas Correa Eduard Knyshov Embark Studios Eugene Bulkin Fabio (decathorpe) Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jendrik Illner Jerome Froelich Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg William Roe Zak van der Merwe Zachary Snyder Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho

Associated items: functions and methods, constants, types, and (very briefly!) GATs. Show Notes Iterator source the first Traits deep dive episode RFC #1598 RFC #195 The Reference on associated items Rust 1.20 deals.manning.com/new-rustacean Sponsors Thanks to Manning for sponsoring the show and giving all of you a 40%-off discount on their whole store (but especially Carol Nichols’ and Jake Goulding’s Rust in Motion video content and the Rust in Action MEAP!) at deals.manning.com/new-rustacean Patreon Sponsors Adam Green Aleksey Pirogov Alexander Kryvomaz Alexander Lozada Alexander Payne Andrew Dirksen Andrew Thompson Anthony Deschamps Anthony Scotti Arlen Haftevani Arlo (Hyena) beaorn Behnam Esfahbod Benjamin Manns Benjamin Wasty Brandon ‘Spanky’ Mills Brian Casiello Brian Manning Brian McCallister Bryan Stitt Caryn Finkelman Cass Costello Cat Dad Chap Lovejoy Charlie Egan Chip Chris Palmer Christoffer Ceutz Dan Abrams Daniel Daniel Bross Daniel Collin Daniel Mason David Carroll David Hewson Derek Morr Doug Reeves Douglas Correa Eduard Knyshov Embark Studios Eugene Bulkin Fabio (decathorpe) Gaveen Prabhasara Graham Wihlidal Henri Sivonen Ian Jones Hoàng Đức Hiếu “Jake”“ferris”" Taylor" Jako Danar James Cooper James Hagans II Jason Bowen Jendrik Illner Jerome Froelich Joar Wandborg Johan Andersson John Rudnick Jon Jonah Jonathan Knapp Jonathan Turner Joseph Hain Joseph Mou Joseph Schrag Joe Percy Justin Ossevoort Kai Yao Kazutaka Mise Keith Gray Kilian Rault Lee Jenkins Luca Schmid Luiz Irber Lukas Eller Malnormalulo Martin Heuschober Masashi Fujita Matt Rudder Matthew Brenner Matthias Ruszala Max Jacobson Max R.R. Collada Messense Lv Micael Bergeron Michael Mc Donnell Michael Melanson Michael Sanders Nathan Sculli Nick Coish Nick Gideo Nick Stevens Nicolas Pochet Olaf Leidinger Oliver Uvman Oluseyi Sonaiya Ovidiu Curcan Pascal Patrick O’Doherty Paul Naranja Paul Osborne Peter Scholtens Peter Tillemans Pierre-Antoine Champin Ralph Giles Ramon Buckland Randy MacLeod Raph Levien Richard Dallaway Rob Tsuk Robbie Clarken Robert Chrzanowski Ryan Blecher Ryan Osial Scott Moeller Sebastián Ramírez Magrí Simon Dickson Simon G Soren Bramer Schmidt Steffen Loen Sunde Steve Jenson Steven Knight Steven Murawski Stuart Hinson Tim Brooks Tim Süberkrüb Tom Prince Toolmaker’s Guild Ty Overby Tyler Harper Victor Kruger Will Greenberg William Roe Zak van der Merwe Zachary Snyder Zaki (Thanks to the couple people donating who opted out of the reward tier, as well. You know who you are!) Become a sponsor Patreon Venmo Dwolla Cash.me Flattr PayPal.me Contact New Rustacean: + Twitter: @newrustacean + Email: [email protected] Chris Krycho + GitHub: chriskrycho + Twitter: @chriskrycho