def eight_head

stelliferous@0.0.2.0 · proofs/kernel_tile_witness.bend:60

import Base
import stelliferous@0.0.2.0/kernel_block.bend as Block
import stelliferous@0.0.2.0/kernel_tile.bend as Tile
import stelliferous@0.0.2.0/proofs/traversal_witness.bend as TraversalWitness

60def eight_head(~State: Type,~Context: Data,~Evidence: @-state: State -> Data,
61  ~read: State -> Context -> Nat -> State & F32,
62  ~read_preserves: @-state: State -> @context: Context -> @index: Nat -> Evidence(state) -> TraversalWitness.Sample<State,F32,state,read(state,context,index)>,
63  -state: State,+context: Context,-head: F32,+evidence: Evidence(state)) ->
64  TraversalWitness.Sample<State,Block.Twin<Block.Twin<Block.Twin<F32>>>,state,
65    Block.read_pair(~State,~Tile.HeadContext<Context>,~Block.Twin<Block.Twin<F32>>,
66      ~Block.read_pair(~State,~Tile.HeadContext<Context>,~Block.Twin<F32>,
67        ~Block.read_pair(~State,~Tile.HeadContext<Context>,~F32,~Tile.read_with_head(~State,~Context,~read),~1n),~2n),~4n,state,Tile.HeadContext{head,context},0n)>:
68  pair(~State,~Tile.HeadContext<Context>,~Block.Twin<Block.Twin<F32>>,
69    ~Block.read_pair(~State,~Tile.HeadContext<Context>,~Block.Twin<F32>,
70      ~Block.read_pair(~State,~Tile.HeadContext<Context>,~F32,~Tile.read_with_head(~State,~Context,~read),~1n),~2n),~4n,state,Tile.HeadContext{head,context},0n,
71    four_head(~State,~Context,~Evidence,~read,~read_preserves,state,context,head,0n,evidence),
72    four_head(~State,~Context,~Evidence,~read,~read_preserves,state,context,head,4n,evidence))