- We now consistently desugar an expect in the last position as
`Void`. Regardless of the pattern. Desugaring to a boolean value is
deemed too confusing.
- This commit also removes the desugaring for let-binding. It's only
ever allowed for _expect_ which then behaves like a side effect.
- We also now allow tests to return either `Bool` or `Void`. A test
that returns `Void` is treated the same as a test returning `True`.
As well as fixing a couple of other issues thanks to conformance
tests. Some functions like multiply_integer or verify_ed25519_signature
have also slightly changed their costing function.
There were some odd discrepancy for `integerToByteString` on the mem
side. Either 1 or about 1000 mem units off; which I couldn't quite
figure out. Yet, it proves useful to validate builtin at large and
ensure we have a valid cost model for v3.
This covers every proposal procedures but protocol parameters, this
one is yet to be done. It spans over 30+ fields, and felt like it is a
big enough piece to tackle it on its own.
Alongside a bunch of other stuff from the coverage list. In
particular, the mint transaction contains:
- reference inputs
- multiple outputs, with assets, and type-0, type-1 and type-6
addresses.
- an output with a datum hash
- an output with an inline script
- carries an extra datum witness, preimage of the embedded hash
- mint, with 2 policies purposely ordered wrongly, with 1 and 2
assets purposely ordered wrong. One of the mint is actually a
burn (i.e. negative quantity)
This is intense, as we still want to preserve the serializer for V1 &
V2, and I've tried as much as possible to avoid polluting the
application layer with many enum types such as:
```
pub enum TxOut {
V1(TransactionOutput),
V2(TransactionOutput),
V3(TransactionOutput),
}
```
Those types make working with the script context cumbersome, and are
only truly required to provide different serialisation strategies. So
instead, we keep one top-level `TxInfo V1/V2/V3` type, and we ensure
to pass serialization strategies as type wrappers.
This way, the strategy propagates through the structure up until it's
eliminated when it reaches the relevant types.
All-in-all, this strikes a correct balance between maintainability and
repetition; and it makes it possible to define _different but mostly
identical_ encoders for the various versions.
With it, I've been able to successfully encode a V3 script context and
match it against one produced using the Haskell libraries. More to
come.
It is impossible to serialize/deserialize a Data with a negative
constructor. So the only way this can happen is by programmatically
construct a value using builtin constr_data.
While possible, it is entirely at the responsibility of the
programmer, but not malleable from an attacker who can only provide
values as 'Data' (and thus, must be decoded like others).
Cloning a 'Term' is potentially dangerous, so we don't want this to
happen by mistake. So instead, we pass in var names and turn them into
terms when necessary.
While the ledger doesn't allow deserializing negative constr value,
they are still possible at the machine level. So, we better make sure
that we don't make assumptions regarding this.
There are currently two zero-arg builtins:
- mkNilData
- mkNilPairData
And while they have strictly speaking no arguments, the VM still
requires that they are called with an extra unit argument applied.
jmhrpr