040 expression string capture

// Test 210_040: Expression String Capture
// Validates that Expression parameters correctly capture strings with special chars

const std = @import("std");

~[comptime|transform]event test.expr { expr: Expression, program: *const Program, allocator: std.mem.Allocator }
| transformed { program: *const Program }

~proc test.expr {
    std.debug.print("Captured expression: '{s}'\n", .{expr});
    return .{ .transformed = .{ .program = program } };
}

// Test 1: Simple string with comma inside
~test.expr("Hello, world")
| transformed _ |> _

// Test 2: String with multiple commas
~test.expr("one, two, three")
| transformed _ |> _

// Test 3: Escaped quotes - works!
~test.expr("Hello \"world\"")
| transformed _ |> _