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Improve error message for mismatched formats.

That caught me many times.

--- a/lib/std/fmt.myr

+++ b/lib/std/fmt.myr

@@ -180,6 +180,9 @@

 		match (state, (b : char))

 		/* raw bytes */

 		| (`Copy, '{'):

+			if nfmt > nvarargs

+				die("too few values for fmt\n")

+			;;

 			if (fmt[i] : char) == '{'

 				b = fmt[i++]

 				sbputb(sb, ('{' : byte))

@@ -238,7 +241,7 @@

 		;;

 	;;

 	if nfmt != nvarargs

-		die("too many params for fmt\n")

+		die("too many values for fmt\n")

 	;;

 	-> sb.len

 }

@@ -463,7 +466,7 @@

 		| ("x", ""):	ip.base = 16

 		| ("w", wid):	ip.padto = getint(wid, "fmt: width must be integer")

 		| ("p", pad):	ip.padfill = decode(pad)

-		| (opt, arg):	

+		| (opt, arg):

 			std.write(2, "fmt: ")

 			std.write(2, opt)

 			std.write(2, "arg: ")

-- 

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