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]tor test.expr { expr: Expression, program: *const std/compiler:Program, allocator: std.mem.Allocator } -> *const Program

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

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

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

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