Tophat crashes on drawing an image stored in a local variable

Code example: ``` import ( "std.um" "th.um" "window.um" "image.um" ) fn test() { img, err := image::mk({0, 0, 0, 0}, {2, 2}) std::exitif(err) std::assert(img.validate()) img.draw(th::mkTransform({0, 0})) } fn init*() { window::setup("Test", 800, 600) window::onFrame.register({ test() }) } ``` Result: ``` sg][error][id:308] lib/sokol/sokol_gfx.h:18483:0: VALIDATE_ABND_IMG_EXISTS: sg_apply_bindings: bound image no longer alive [sg][error][id:318] lib/sokol/sokol_gfx.h:18514:0: VALIDATE_ABND_SMP_EXISTS: sg_apply_bindings: bound sampler no longer alive [sg][panic][id:346] lib/sokol/sokol_gfx.h:17554:0: VALIDATION_FAILED: validation layer checks failed ABORTING because of [panic] ```