118 invariants gate holds and inference

✓ Passing This code compiles and runs correctly.

Code

// The git-gate passes: a checked invariant under its ceiling holds, and a
// "git-gate"-tagged invariant WITHOUT a check is decided by inference — the
// gate prints its rule for the reviewer and exits zero. A rule no algorithm
// can decide is the module's purpose, not a failure.
//
// Run: koruc input.kz invariants gate

~import std/invariants

~std/invariants:inferred {
    "name": "counted-loops-are-for",
    "tags": ["git-gate"],
    "rule": "A counted loop is a for; a while is legitimate only where the trip count is not known up front.",
    "check": "c=$(grep -c 'while (' fixture.zig); echo while sites: $c of 3; [ $c -le 3 ]"
}

~std/invariants:inferred {
    "name": "comment-language",
    "tags": ["git-gate"],
    "rule": "Comments are written in English, not Norwegian."
}

~tor main {}

~proc main|zig {
}

~main()

input.kz

Flows

flow ~inferred click a branch to expand · @labels scroll to their anchor

inferred (source: "name": "counted-loops-are-for", "tags": ["git-gate"], "rule": "A counted loop is a for; a while is legitimate only where the trip count is not known up front.", "check": "c=$(grep -c 'while (' fixture.zig); echo while sites: $c of 3; [ $c -le 3 ]")

flow ~inferred click a branch to expand · @labels scroll to their anchor

inferred (source: "name": "comment-language", "tags": ["git-gate"], "rule": "Comments are written in English, not Norwegian.")

flow ~main click a branch to expand · @labels scroll to their anchor

main

Test Configuration

Post-validation Script:

#!/bin/bash
# A gate with every check under its ceiling exits zero; an inference-only
# git-gate invariant is handed to the reviewer as rule text, not failed.

set -e

OUT=$(koruc "$KORU_INPUT" invariants gate 2>&1) && RC=0 || RC=$?

[ "$RC" -eq 0 ] \
    || { echo "FAIL: gate exited $RC with no violated invariant"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "counted-loops-are-for" \
    || { echo "FAIL: checked invariant not named"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "holds" \
    || { echo "FAIL: holding verdict not reported"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "while sites: 3 of 3" \
    || { echo "FAIL: check evidence not shown"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "comment-language" \
    || { echo "FAIL: inference invariant not surfaced by the gate"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "Comments are written in English, not Norwegian." \
    || { echo "FAIL: inference rule text not handed to the reviewer"; echo "$OUT"; exit 1; }
echo "$OUT" | grep -q "1 held, 0 violated, 1 by inference" \
    || { echo "FAIL: gate tally wrong"; echo "$OUT"; exit 1; }

echo "=== Test passed: gate held and surfaced the inference rule ==="

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