026 auto discharge warn

✓ Passing This code compiles and runs correctly.

Code

// TEST: Auto-discharge warn mode via --auto-discharge=warn flag
//
// When --auto-discharge=warn is set, the compiler should:
// 1. Still auto-insert disposal calls (compilation succeeds)
// 2. Emit warnings about what was auto-inserted
//
// This test verifies that warnings are emitted when requested.
// The post.sh script checks for the warning in compile_kz.err.
//
// Expected: Successful compilation WITH warning output

~import "$app/fs"

// Open a file but don't close it - auto-discharge will insert close()
// With --auto-discharge=warn, we should see the warning
~app.fs:open(path: "test.txt")
| opened _ |> _

input.kz

Imported Files

// Library module: fs
// Single disposal event - auto-discharge should work

const std = @import("std");

const File = struct { handle: i32 };

// Open a file - returns opened! state (requires cleanup)
~pub event open { path: []const u8 }
| opened { file: *File[opened!] }

~proc open {
    std.debug.print("Opening file\n", .{});
    const f = std.heap.page_allocator.create(File) catch unreachable;
    f.* = File{ .handle = 42 };
    return .{ .opened = .{ .file = f } };
}

// Close - the ONLY consumer of [!opened]
~pub event close { file: *File[!opened] }
| closed {}

~proc close {
    std.debug.print("Closing file (auto-discharged)\n", .{});
    return .{ .closed = .{} };
}

fs.kz

Test Configuration

Compiler Flags:

--auto-discharge=warn

Post-validation Script:

#!/bin/bash
# Post-validation: Verify auto-discharge warning was emitted
#
# This test passes if:
# 1. Compilation succeeded (handled by test runner)
# 2. Warning about auto-discharge insertion is present in backend.err
#
# Note: The warning is emitted during backend execution (not frontend),
# so we check backend.err, not compile_kz.err

# Check for the warning in backend.err (backend execution stderr)
if grep -q "warning\[AUTO-DISCHARGE\]" backend.err 2>/dev/null; then
    echo "Found auto-discharge warning in backend.err"
    exit 0
else
    echo "ERROR: Expected warning[AUTO-DISCHARGE] in backend.err"
    echo "Contents of backend.err:"
    head -50 backend.err 2>/dev/null || echo "(file not found)"
    exit 1
fi

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