use stduse testr const main = {	testr.run([		[.name="fullstr",			.fn={ctx; swap(ctx, "src", "src", "dst", "dst")}],		[.name="head",			.fn={ctx; swap(ctx, "srcstuff", "src", "dst", "dststuff")}],		[.name="tail",			.fn={ctx; swap(ctx, "stuffsrc", "src", "dst", "stuffdst")}],		[.name="middle",			.fn={ctx; swap(ctx, "stusrcff", "src", "dst", "studstff")}],		[.name="multi",			.fn={ctx; swap(ctx, "srcstusrcffsrc", "src", "dst", "dststudstffdst")}],		[.name="overlap",			.fn={ctx; swap(ctx, "aaaaa", "aaa", "bbb", "bbbaa")}],	][:])} const swap = {ctx, in, src, dst, expected	var r 	r = std.strreplace(in, src, dst)	testr.check(ctx, std.eq(r, expected), "got {}, expected {}\n", r, expected)	std.slfree(r)}