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If you believe this is docs.rs' fault, open an issue.
The serialized instructions of the current transaction.
The instructions sysvar provides access to the serialized instruction data for the currently-running transaction. This allows for instruction introspection, which is required for correctly interoperating with native programs like the secp256k1 and ed25519 programs.
Unlike other sysvars, the data in the instructions sysvar is not accessed
through a type that implements the Sysvar trait. Instead, the
instruction sysvar is accessed through several free functions within this
module.
See also the Trezoa documentation on the instructions sysvar.
Examples
For a complete example of how the instructions sysvar is used see the
documentation for secp256k1_instruction in the trezoa-sdk crate.