019 subflow multiline call

// ============================================================================
// Test 210_019: COMPILE_ONLY — multi-line call args fold correctly inside a
//               subflow continuation chain.
//
// Parens hug their arguments (f2f67db50): `f(` hugs the first arg, `)` hugs
// the last. Within that style a call may span lines, and the continuation
// `|>` after the closing paren must keep parsing as part of the subflow —
// this pins that shape. (Historical: this test once pinned a bug where the
// fold lost subflow context after a multi-line call.)
//
// The subflow form is the intended authoring model — no proc workaround.
// ============================================================================

const std = @import("std");

~tor step-a { x: i32 } -> i32

~proc step-a|zig {
    return x + 1;
}

~tor step-b { a: i32, b: i32, c: i32 } -> i32

~proc step-b|zig {
    return a + b + c;
}

~tor step-c { x: i32 } -> i32

~proc step-c|zig {
    return x * 2;
}

~tor test-multiline-call {} -> i32

~test-multiline-call = step-a(x: 10): a |> step-b(a,
    b: 20,
    c: 30): b |> step-c(x: b): c -> c

// Main flow
~test-multiline-call()