-- paren-calls.ilo: Demonstrating paren-form call syntax (ILO-51)
--
-- `f(a, b)` is sugar for `f a b`. Both produce identical AST nodes.
-- Postfix (whitespace-separated) stays the canonical idiom; paren-form
-- is accepted everywhere for agents trained on Python/JS/Rust/TS who
-- reach for parentheses by reflex.
--
-- Disambiguation rule:
-- f(x) -- `(` immediately adjacent to ident -> paren-call
-- f (x) -- space before `(` -> postfix call with grouped-expr arg
-- Both forms produce `Call { function: f, args: [x] }`.
--
-- Non-goal: `ilo fmt` does NOT rewrite paren-form to postfix.
-- Basic 2-arg: spl(s, ",") same as spl s ","
split-csv s:t > L t
spl(s, ",")
split-csv-postfix s:t > L t
spl s ","
-- 1-arg adjacent paren: abs(x) same as abs x
absolute x:n > n
abs(x)
-- Nested paren-calls: sqrt(abs(x))
sqrt-abs x:n > n
sqrt(abs(x))
-- Paren-call inside a prefix binary expression: + 1 (sqrt x)
shifted x:n > n
+ 1 sqrt(x)
-- main entry: demonstrate paren-calls at runtime
main > L t
spl("hello,world,foo", ",")