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rose-ash/lib/apl
giles b661318a45
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apl: train/fork notation (f g h) and (g h) (+6 tests, 496/496)
Parser: when a parenthesised subexpression contains only function
segments (>= 2), collect-segments-loop now emits a :train AST node
instead of treating it as a value-producing expression.

Resolver: apl-resolve-{monadic,dyadic} handle :train.
- monadic 2-train (atop):  (g h)⍵ = g (h ⍵)
- monadic 3-train (fork):  (f g h)⍵ = (f ⍵) g (h ⍵)
- dyadic 2-train:          ⍺(g h)⍵ = g (⍺ h ⍵)
- dyadic 3-train:          ⍺(f g h)⍵ = (⍺ f ⍵) g (⍺ h ⍵)

apl-run "(+/÷≢) 1 2 3 4 5"  → 3   (mean)
apl-run "(- ⌊) 5"           → -5  (atop)
apl-run "2 (+ × -) 5"       → -21 (dyadic fork)
apl-run "(⌈/-⌊/) 3 1 4 …"   → 8   (range)
2026-05-07 19:02:17 +00:00
..