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refactor(lang): rename the fn keyword to function

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Expand the function-declaration keyword to the full word across the whole
language and toolchain:
  fn name(...) -> T { ... }   ->   function name(...) -> T { ... }

Done as a self-hosting migration: teach the parser both spellings, reseed,
rewrite every .ludic definition to `function`, then drop `fn`. The compiler
now rejects `fn`. Touches the parser, all selfhost/tools/runtime/example/test
sources, the grammars (TextMate shared+vscode, ludic_syntax.h, JetBrains
LudicTokens.kt), the LSP and formatter, the Python doc/vocab tools
(check-impl, check-docs, validate, palette, test-lsp), and the docs
(fences, prose, kw-fn -> kw-function).

Reseeded; C-free bootstrap fixpoint holds. All suites green (45 regression,
24 self-host, 29 tool); the docs site generates and check.py passes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-30 01:43:22 +03:00
parent 2f19c8d8e2
commit 4c48077d68
86 changed files with 793 additions and 793 deletions
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LANGUAGE.md
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@ -502,7 +502,7 @@ object, so assigning or passing one shares it rather than copying.
```ludic
property Tok { kind: int = 0, line: int = 0, next: Tok }
fn bump(t: Tok) -> void { t.kind = t.kind + 1 }
function bump(t: Tok) -> void { t.kind = t.kind + 1 }
handler Share phase Update {
let a = new Tok
@ -560,9 +560,9 @@ fields: `toks[i].kind = T_ID` is a single address computation.
## Functions & FFI
```ludic
fn heal(amount: int) -> int { return amount * 2 }
function heal(amount: int) -> int { return amount * 2 }
extern fn c_hypot(a: fixed, b: fixed) -> fixed = "hypot_fx" # bind a C symbol
extern function c_hypot(a: fixed, b: fixed) -> fixed = "hypot_fx" # bind a C symbol
```
`extern fn … = "symbol"` declares a foreign function and binds it to a symbol
resolved at link time; pass `-L`/`-l` to ludicc to link its library. This is how