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Error if we forgot to give code to build.

--- a/mbld/main.myr

+++ b/mbld/main.myr

@@ -67,9 +67,15 @@

 	b = mkbuild(tags)

 	if targname.len != 0

+		if cmd.args.len == 0

+			std.fatal("nothing to compile\n")

+		;;

 		bld.opt_objdir = objdir

 		ok = buildimm(b, targname, cmd.args)

 	elif runsrc.len != 0

+		if cmd.args.len == 0

+			std.fatal("nothing to run\n")

+		;;

 		bld.opt_objdir = objdir

 		bld.opt_verbosity = -1

 		tmp = std.mktemppath("runmyr")