039 file source syntax

// Test 210_039: File Source Syntax
// Validates the @"path" syntax for reading files as Source at compile time
//
// Syntax: event @"path" — the kind tag is declared once on the
// parameter (`source: Source[text]`), never echoed at the call site.

const std = @import("std");

// Event that takes Source parameter
~[comptime|transform]tor render.file {
    source: Source[text],
    program: *const Program,
    allocator: std.mem.Allocator
}
| transformed *const Program

~proc render.file|zig {
    // Just print what we received to prove file was read
    std.debug.print("File content: '{s}'\n", .{source.text});
    std.debug.print("Phantom type: '{s}'\n", .{source.phantom_type orelse "none"});

    // Return program unchanged
    return .{ .transformed = program };
}

// Test: Read file content using [type]"path" syntax
~render.file @"hello.txt"
| transformed _ |> _