use std const main = {	var sb	var buf : byte[16] 	sb = std.mksb()	std.assert(std.eq(std.sbpeek(sb), ""), "mismatched empty str\n")	std.sbputs(sb, "hello")	std.assert(std.eq(std.sbpeek(sb), "hello"), "mismatched hello\n")	std.sbputs(sb, ", hello")	std.assert(std.eq(std.sbpeek(sb), "hello, hello"), "mismatched double hello\n")	std.sbtrim(sb, 7)	std.assert(std.eq(std.sbpeek(sb), "hello, "), "mismatched trim\n")	std.sbputs(sb, "world")	std.assert(std.eq(std.sbpeek(sb), "hello, world"), "mismatched hello world\n")	std.sbtrim(sb, -5)	std.assert(std.eq(std.sbpeek(sb), "hello, "), "mismatched rtrim\n")	std.sbputc(sb, '世')	std.sbputc(sb, '界')	std.assert(std.eq(std.sbpeek(sb), "hello, 世界"), "mismatched unicode\n")	std.sbputb(sb, 10)	std.assert(std.eq(std.sbpeek(sb), "hello, 世界\n"), "mismatched byte\n") 	sb = std.mkbufsb(buf[:])	std.assert(std.sbputs(sb, "hello"), "failed to add hello\n") /* 5 characters */	std.assert(std.sbputs(sb, "hello"), "failed to add hello\n") /* 10 characters */	std.assert(std.sbputs(sb, "hello"), "failed to add hello\n") /* 15 characters */	std.assert(!std.sbputs(sb, "hello"), "erronous success\n") /* 16 characters */	std.assert(std.eq(std.sbpeek(sb), "hellohellohelloh"), "failed to copy as much as possible\n")	std.sbtrim(sb, -1)	std.assert(std.eq(std.sbpeek(sb), "hellohellohello"), "failed rtrim\n")	std.sbputc(sb, '世')	std.assert(std.eq(std.sbpeek(sb), "hellohellohello"), "modified overflowed putc\n")	std.sbtrim(sb, -2)	std.assert(std.eq(std.sbpeek(sb), "hellohellohel"), "failed rtrim\n")	std.sbputc(sb, '世')	std.assert(std.eq(std.sbpeek(sb), "hellohellohel世"), "failed to append with putc\n")}