Produce proper error for field attributes when deriving Deserial

Concordium / concordium-contracts-common

Common functionality used by smart contracts and the host environment on the Concordium blockchain.

Mozilla Public License 2.0

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Produce proper error for field attributes when deriving Deserial #93

Closed limemloh closed 1 year ago

limemloh commented 1 year ago

Purpose

Fix error when users provide an invalid field attribute.

Currently, when deriving Deserial or DeserialWithState for a struct with an invalid field attribute such #[concordium(size_length = "2")], where this is expected to be a number literal.

Expected:

Actual: