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Passing Passing: the compiler rejects this program as expected.
Code
// PIN (2026-07-05): a call inside an if CONDITION expression is ILLEGAL —
// calls are not expressions (see concepts/frag-arguments-are-atoms). The
// idiom is bind-first:
// g(a: 4): x |> if(x > 3) ...
//
// Guarded by the KORU104 expression-admission wall (flow_checker, Stage A);
// if-conditions parse as invocation arguments, so the argument walk covers
// them. Before the wall: `if (g(a: 4) > 3)` pasted verbatim into emitted
// Zig, raw Stage-D host error.
import std/io
pub tor g { a: i64 } -> i64
g -> a + 1
pub tor pick {} -> i64
pick = if(g(a: 4) > 3)
| then -> 1
| else -> 2
pick(): v |> std/io:print.ln("{{ v:d }}")
Actual compiler output
error[KORU104]: nested call in argument 'expr' — calls are not expressions; use tor chaining: bind the result first
--> tests/regression/320_CONTROL_FLOW/320_128_call_in_if_condition/input.k:16:0
|
16 | pick = if(g(a: 4) > 3)
| ^
hint: rewrite as `tor(args): x |> ...` and use `x` hereFrontend must reject with:
CONTAINS error[KORU104
CONTAINS nested call
CONTAINS chainFlows
subflow ~pick click a branch to expand · @labels scroll to their anchor
if (g(a: 4) > 3)
flow ~pick click a branch to expand · @labels scroll to their anchor
pick
Test Configuration
MUST_ERROR