Rondo Dondo
@maplant.com
NYC based programmer. I mostly talk about implementing functional programming languages
Another day, another problem solved with a macro
November 23, 2025 at 11:52 PM
Another day, another problem solved with a macro
I recall you only struggled because I was pretty terrible at giving help/explaining things...
November 23, 2025 at 7:30 PM
I recall you only struggled because I was pretty terrible at giving help/explaining things...
Strict provenance APIs are pretty dang sweet, and Miri kicks ass
November 20, 2025 at 2:46 PM
Strict provenance APIs are pretty dang sweet, and Miri kicks ass
(Calculating the most wrong take on the subject possible): It should be a power letter instead
November 19, 2025 at 6:40 PM
(Calculating the most wrong take on the subject possible): It should be a power letter instead
Obviously most Rust programmers know that unwrap can panic but what about the one programmer whose sole understanding of Rust is through type signatures that went “wow this function takes an Option and returns a T? That’s exactly what I need!”
November 19, 2025 at 6:32 PM
Obviously most Rust programmers know that unwrap can panic but what about the one programmer whose sole understanding of Rust is through type signatures that went “wow this function takes an Option and returns a T? That’s exactly what I need!”
I think panic is the equivalent since Rust doesn’t have exceptions
November 19, 2025 at 3:13 PM
I think panic is the equivalent since Rust doesn’t have exceptions
It really should have been called unwrap_or_panic
November 19, 2025 at 2:46 PM
It really should have been called unwrap_or_panic
Update: I did
I just need to make my call/cc implementation about 8x faster and I'll be happy.
November 14, 2025 at 9:33 PM
Update: I did
Somehow managed to implement R6RS ports... in both async and sync Rust github.com/maplant/sche...
github.com
November 14, 2025 at 12:06 AM
Somehow managed to implement R6RS ports... in both async and sync Rust github.com/maplant/sche...
scheme-rs now has delimited continuations github.com/maplant/sche...
Dynamic Delimited Continuations via Prompts by maplant · Pull Request #187 · maplant/scheme-rs
This PR adds dynamic delimited continuations via call-with-prompt and abort-to-prompt. It's pretty bare-bones (and possibly buggy) I'll need to at some point add prompt tags instead of just...
github.com
November 13, 2025 at 1:05 AM
scheme-rs now has delimited continuations github.com/maplant/sche...
Taking psychic damage discovering the with-input-from-file and with-output-from-file functions in the R6RS spec, which seemingly require another continuation mark to function
November 6, 2025 at 9:04 PM
Taking psychic damage discovering the with-input-from-file and with-output-from-file functions in the R6RS spec, which seemingly require another continuation mark to function
There’s certainly some friction when you start combining things. I’ve always been annoyed how dyn has a secret lifetime that you can add to it
November 6, 2025 at 2:34 PM
There’s certainly some friction when you start combining things. I’ve always been annoyed how dyn has a secret lifetime that you can add to it
American Giant. I really like their stuff!
November 6, 2025 at 2:20 PM
American Giant. I really like their stuff!
Was almost put off from buying some pants from a brand I really like because I made the mistake of googling the pants plus reddit and saw a scathing review on r/BuyItForLife, but then I realized you'd have to be pretty damn stupid to think pants are a thing you could "buy for life"
November 6, 2025 at 1:55 PM
Was almost put off from buying some pants from a brand I really like because I made the mistake of googling the pants plus reddit and saw a scathing review on r/BuyItForLife, but then I realized you'd have to be pretty damn stupid to think pants are a thing you could "buy for life"
The secret to doing IO properly is to have a buffer which writes to a buffer which writes to a buffer which writes to another buffer which writes to a buffer
November 6, 2025 at 12:07 AM
The secret to doing IO properly is to have a buffer which writes to a buffer which writes to a buffer which writes to another buffer which writes to a buffer
Wow, “Cool Girls for Capitalism” wasnt a winning campaign slogan?
November 5, 2025 at 1:31 PM
Wow, “Cool Girls for Capitalism” wasnt a winning campaign slogan?
Reposted by Rondo Dondo
Worlds worst encoding JFC
November 4, 2025 at 11:29 PM
Worlds worst encoding JFC
I have learned so much more about utf-16 than I ever wanted to learn, which is to say I learned a little bit
November 4, 2025 at 11:29 PM
I have learned so much more about utf-16 than I ever wanted to learn, which is to say I learned a little bit
Implementing the entire R6RS port system from scratch has been such a slog but I see the light at the end of the tunnel
November 4, 2025 at 9:31 PM
Implementing the entire R6RS port system from scratch has been such a slog but I see the light at the end of the tunnel
When the last of the black holes evaporate I will be there to remember where the name "nopert" came from
October 24, 2025 at 10:02 PM
When the last of the black holes evaporate I will be there to remember where the name "nopert" came from
Behold, my beautiful proc macros that let me avoid importing the maybe_async crate
October 24, 2025 at 9:57 PM
Behold, my beautiful proc macros that let me avoid importing the maybe_async crate
I believe the more relevant issue is that the Arc that sees the ref count drop to zero is the one that drops it. Thus, if you cannot guarantee that the drop occurs on the same thread that the inner type is locked to
October 24, 2025 at 9:57 PM
I believe the more relevant issue is that the Arc that sees the ref count drop to zero is the one that drops it. Thus, if you cannot guarantee that the drop occurs on the same thread that the inner type is locked to
Damn that game ripped so hard
October 24, 2025 at 8:57 PM
Damn that game ripped so hard
Not only that, but into_inner returns the inner type if reference count is 1
October 24, 2025 at 8:57 PM
Not only that, but into_inner returns the inner type if reference count is 1