Disabled external gits

cs420-acc/l3-compiler/tests/prim-add.l3

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+;; In Emacs, open this file in -*- Scheme -*- mode
+
+;; Test the @+ primitive
+
+(@byte-write 70)
+
+(@byte-write (@+ 65 0))                 ;A
+(@byte-write (@+ 0 66))                 ;B
+(@byte-write (@+ 68 -1))                ;C
+(@byte-write (@+ -1 69))                ;D
+(@byte-write (@+ 1073741823 70))        ;E
+(@byte-write (@+ 71 1073741823))        ;F