shithub: mc

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Improve error message for missing deps.

--- a/mbld/deps.myr

+++ b/mbld/deps.myr

@@ -374,7 +374,7 @@

 const edge = {g, n, e

 	match std.htget(g.gen, e)

 	| `std.None:

-		std.fatal("nothing satisfies {} for {}\n", e, n.lbl)

+		std.fatal("{}: missing build rule for {}\n", n.lbl, e)

 	| `std.Some d:	

 		std.slpush(&n.ndep, d)

 		std.slpush(&d.ngen, n)