Most files suffered major changes

- Less ambiguous syntax
- Better parser (Chumsky only does tokenization now)
- Tidy(|ier) error handling
- Facade for simplified embedding
- External code grouped in (fairly) self-contained Systems
- Dynamic action dispatch
- Many STL additions

ROADMAP.md

@@ -1,5 +1,49 @@
-# IO
+This document is a wishlist, its items aren't ordered in any way other than inline notes about dependency relations
 
-All IO is event-based via callbacks.
-Driven streams such as stdin expose single-fire events for the results of functions such as "read until terminator" or "read N bytes".
-Network IO exposes repeated events such as "connect", "message", etc.
+# Language
+
+## Operator declarations
+A dedicated (exportable) line type for declaring operators. Still just names, only you can write them next to other things without whitespace
+
+- ops may not contain c-ident-safe characters
+- clusters of operator characters are broken up with a greedy algorithm
+
+## Typeclasses
+Elixir-style protocols probably, only with n-ary dispatch which I saw in SICP-js
+
+# Rules
+
+## Placeholder constraints
+Simultaneously match a pattern to a subexpression and give it a name to copy it over
+
+- Copy unique 1->1 names over by default to preserve their location info
+
+# STL
+
+## Command short-circuiting
+Functions for each command type which destructure it and pass it to an Orchid callback
+
+## Runtime error handling
+result? multipath cps utils? Not sure yet.
+
+## Pattern matching
+This was the main trick in Orchid, still want to do it, still need to polish the language first
+
+## Macro error handling
+Error tokens with rules to lift them out. Kinda depends on preservation of location info in rules to be really useful
+
+# Systems
+
+## Async
+Join allows to run code when a tuple of pending events all resolve on the event poller
+
+## New: FS
+Exposes tree operations to Orchid
+Uses existing IO to open and read files
+Uses the event bus to read directories in batches without blocking other Orchid code
+
+## New: Network
+Event-driven I/O with single-fire events and resubscription to relay backpressure to the OS. Initially TCP
+
+## New: Marshall
+Serialization of Orchid data, including code, given customizable sets of serializable foreign items. Alternatively, code reflection so that all this can go in the STL