fix: Clean error when attemping to return a slice from Brillig to ACI… #7

Job	Run time
build-acvm-js	1m 17s
build-nargo	6m 34s
build-noirc-abi	1m 17s
ACVM JS (Browser)	2m 32s
ACVM JS (Node.js)	1m 42s
build-noir-wasm	4m 31s
noirc_abi	2m 21s
noir-js-backend-barretenberg	1m 49s
Noir JS	1m 35s
Integration Tests	10m 5s
noir_wasm	1m 5s
noir_codegen	1m 2s
End	1s
	35m 51s

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