make compiler warnings go away

cozo-core/src/runtime/db.rs

@@ -26,7 +26,6 @@ use thiserror::Error;
 
 use crate::data::json::JsonValue;
 use crate::data::program::{InputProgram, QueryAssertion, RelationOp};
-use crate::data::symb::Symbol;
 use crate::data::tuple::Tuple;
 use crate::data::value::{DataValue, LARGEST_UTF_CHAR};
 use crate::parse::sys::SysOp;
@@ -785,10 +784,12 @@ impl Poison {
         }
         Ok(())
     }
-    pub(crate) fn set_timeout(&self, secs: f64) -> Result<()> {
     #[cfg(feature = "nothread")]
+    pub(crate) fn set_timeout(&self, _secs: f64) -> Result<()> {
         bail!("Cannot set timeout when threading is disallowed");
-
+    }
+    #[cfg(not(feature = "nothread"))]
+    pub(crate) fn set_timeout(&self, secs: f64) -> Result<()> {
         let pill = self.0.clone();
         thread::spawn(move || {
             thread::sleep(Duration::from_micros((secs * 1000000.) as u64));

cozo-core/src/storage/mem.rs

@@ -11,8 +11,8 @@ use std::collections::btree_map::Range;
 use std::collections::BTreeMap;
 use std::default::Default;
 use std::iter::Fuse;
+use std::mem;
 use std::sync::{Arc, RwLock, RwLockReadGuard, RwLockWriteGuard};
-use std::{mem, thread};
 
 use itertools::Itertools;
 use miette::{bail, Result};
@@ -70,7 +70,7 @@ impl<'s> Storage<'s> for MemStorage {
         #[cfg(feature = "nothread")]
         closure();
         #[cfg(not(feature = "nothread"))]
-        thread::spawn(closure);
+        std::thread::spawn(closure);
         Ok(())
     }