chore: Remove unneeded PhantomData

Author: xxuejie

src/machine/asm/mod.rs

@@ -14,7 +14,6 @@ use ckb_vm_definitions::{
 };
 use rand::{prelude::RngCore, SeedableRng};
 use std::alloc::{alloc, alloc_zeroed, Layout};
-use std::marker::PhantomData;
 use std::mem::MaybeUninit;
 use std::os::raw::c_uchar;
 
@@ -701,18 +700,14 @@ pub type AsmMachine = AbstractAsmMachine<SimpleFixedTraceDecoder>;
 
 pub struct AbstractAsmMachine<Decoder: TraceDecoder> {
     pub machine: DefaultMachine<AsmCoreMachine, Decoder>,
-    phantom: PhantomData<Decoder>,
 }
 
 impl<Decoder: TraceDecoder> DefaultMachineRunner for AbstractAsmMachine<Decoder> {
     type Inner = AsmCoreMachine;
     type Decoder = Decoder;
 
     fn new(machine: DefaultMachine<AsmCoreMachine, Decoder>) -> Self {
-        Self {
-            machine,
-            phantom: PhantomData,
-        }
+        Self { machine }
     }
 
     fn machine(&self) -> &DefaultMachine<AsmCoreMachine, Decoder> {

src/machine/trace.rs

@@ -11,7 +11,6 @@ use super::{
     CoreMachine, DefaultMachine, DefaultMachineRunner, Machine, SupportMachine, VERSION2,
 };
 use bytes::Bytes;
-use std::marker::PhantomData;
 
 // The number of trace items to keep
 const TRACE_SIZE: usize = 8192;
@@ -54,7 +53,6 @@ pub struct AbstractTraceMachine<Inner: SupportMachine, Decoder> {
 
     factory: ThreadFactory<DefaultMachine<Inner, Decoder>>,
     traces: Vec<Trace<DefaultMachine<Inner, Decoder>>>,
-    phantom: PhantomData<Decoder>,
 }
 
 impl<Inner: SupportMachine, Decoder> CoreMachine for AbstractTraceMachine<Inner, Decoder> {
@@ -119,7 +117,6 @@ impl<Inner: SupportMachine, Decoder: InstDecoder> DefaultMachineRunner
             machine,
             factory: ThreadFactory::create(),
             traces: vec![],
-            phantom: PhantomData,
         }
     }