link: Suppress cascading errors.

test/link/cascading-errors.asm

@@ -0,0 +1,19 @@
+SECTION "zero", ROM0[$0]
+Zero:
+
+; Pin the section such that a jr to 0 is out of range
+SECTION "test", ROM0[$1000]
+	;; XXX: the fallback value used is the index of the symbol (in the object file?)
+	;; Is this intended?
+	dw Bar
+	dw Foo / Bar
+	dw Foo / Zero
+
+	rst Foo
+
+	jr NonExist
+
+	ldh a, [hNonExist + $200]
+
+	assert Foo == 42
+	assert WARN, Bar == 42