Remove unused FullCandidateReceipt (#3641)

Currently redesigning candidate data structures, noticed that this one
seems dead.

Co-authored-by: eskimor <eskimor@no-such-url.com>

polkadot/primitives/src/v6/mod.rs

@@ -533,18 +533,6 @@ impl<H> CandidateReceipt<H> {
 	}
 }
 
-/// All data pertaining to the execution of a para candidate.
-#[derive(PartialEq, Eq, Clone, Encode, Decode, TypeInfo, RuntimeDebug)]
-pub struct FullCandidateReceipt<H = Hash, N = BlockNumber> {
-	/// The inner candidate receipt.
-	pub inner: CandidateReceipt<H>,
-	/// The validation data derived from the relay-chain state at that
-	/// point. The hash of the persisted validation data should
-	/// match the `persisted_validation_data_hash` in the descriptor
-	/// of the receipt.
-	pub validation_data: PersistedValidationData<H, N>,
-}
-
 /// A candidate-receipt with commitments directly included.
 #[derive(PartialEq, Eq, Clone, Encode, Decode, TypeInfo, RuntimeDebug)]
 #[cfg_attr(feature = "std", derive(Hash))]

polkadot/roadmap/implementers-guide/src/types/README.md

@@ -55,17 +55,6 @@ digraph {
     CandidateCommitmentsHash [label = "Hash", shape="doublecircle", fill="gray90"]
     CandidateCommitmentsHash -> CandidateCommitments:name
 
-    FullCandidateReceipt [label = <
-        <table>
-            <tr><td border="0" colspan="2" port="name">FullCandidateReceipt&lt;H = Hash, N = BlockNumber&gt;</td></tr>
-            <tr><td>inner</td><td port="inner">CandidateReceipt&lt;H&gt;</td></tr>
-            <tr><td>validation_data</td><td port="validation_data">ValidationData&lt;N&gt;</td></tr>
-        </table>
-    >]
-
-    FullCandidateReceipt:inner -> CandidateReceipt:name
-    FullCandidateReceipt:validation_data -> ValidationData:name
-
     CommittedCandidateReceipt [label = <
         <table>
             <tr><td border="0" colspan="2" port="name">CommittedCandidateReceipt&lt;H = Hash&gt;</td></tr>

polkadot/roadmap/implementers-guide/src/types/candidate.md

@@ -20,12 +20,8 @@ struct ParaId(u32);
 
 ## Candidate Receipt
 
-Much info in a [`FullCandidateReceipt`](#full-candidate-receipt) is duplicated from the relay-chain state. When the
-corresponding relay-chain state is considered widely available, the Candidate Receipt should be favored over the
-`FullCandidateReceipt`.
-
-Examples of situations where the state is readily available includes within the scope of work done by subsystems working
-on a given relay-parent, or within the logic of the runtime importing a backed candidate.
+Compact representation of the result of a validation. This is what validators
+receive from collators, together with the PoV.
 
 ```rust
 /// A candidate-receipt.
@@ -37,24 +33,6 @@ struct CandidateReceipt {
 }
 ```
 
-## Full Candidate Receipt
-
-This is the full receipt type. The `PersistedValidationData` are technically redundant with the `inner.relay_parent`,
-which uniquely describes the block in the blockchain from whose state these values are derived. The
-[`CandidateReceipt`](#candidate-receipt) variant is often used instead for this reason.
-
-However, the Full Candidate Receipt type is useful as a means of avoiding the implicit dependency on availability of old
-blockchain state. In situations such as availability and approval, having the full description of the candidate within a
-self-contained struct is convenient.
-
-```rust
-/// All data pertaining to the execution of a para candidate.
-struct FullCandidateReceipt {
-	inner: CandidateReceipt,
-	validation_data: PeristedValidationData,
-}
-```
-
 ## Committed Candidate Receipt
 
 This is a variant of the candidate receipt which includes the commitments of the candidate receipt alongside the