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Return an error from pledge.

	Debatable if it should abort the program instead,
	but...

--- a/lib/std/pledge+openbsd.myr

+++ b/lib/std/pledge+openbsd.myr

@@ -1,9 +1,18 @@

 use sys

+use "errno"

+use "result"

 pkg std =

-	const pledge	: (promise : byte[:], epromise : byte[:] -> void)

+	const pledge	: (promise : byte[:], epromise : byte[:] -> result(void, errno))

 ;;

 const pledge = {promise, epromise

-	sys.pledge(sys.cstring(promise), sys.cstring(epromise))

+	var r

+

+	r = sys.pledge(sys.cstring(promise), sys.cstring(epromise))

+	if r < 0

+		-> `std.Err (r : errno)

+	else

+		-> `std.Ok void

+	;;

 }

--- a/lib/std/pledge.myr

+++ b/lib/std/pledge.myr

@@ -1,4 +1,6 @@

 use sys

+use "errno"

+use "result"

 pkg std =

 	const pledge	: (promise : byte[:], epromise : byte[:] -> void)