lang: Fix using data as an instruction parameter name in declare_program!

[acheroncrypto]

Problem

Having an instruction parameter named data results in a compilation error when used with declare_program!

error[E0382]: borrow of moved value: `data`
 --> programs/declare-program/src/lib.rs:5:1
  |
5 | declare_program!(external);
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^
  | |
  | value borrowed here after move
  | move occurs because `data` has type `Vec<u8>`, which does not implement the `Copy` trait
  |
  = note: this error originates in the macro `declare_program` (in Nightly builds, run with -Z macro-backtrace for more info)

This happens because that identifier is being used internally here:

anchor/lang/attribute/program/src/declare_program/mods/cpi.rs

Line 74 in b6b4f11

let mut data = Vec::with_capacity(256);

Summary of changes

• Fix being unable to use data as an instruction parameter name in declare_program!
• Add a compilation test

Fixes #3572

[vercel]

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