diff --git a/src/api/deprecated.rs b/src/api/deprecated.rs
index 62d7b52c..1c911637 100644
--- a/src/api/deprecated.rs
+++ b/src/api/deprecated.rs
@@ -4,6 +4,7 @@ use crate::{
     Dynamic, Engine, EvalAltResult, Expression, FnPtr, ImmutableString, NativeCallContext,
     Position, RhaiResult, RhaiResultOf, Scope, AST,
 };
+use std::path::PathBuf;
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
 
@@ -22,7 +23,7 @@ impl Engine {
     #[cfg(not(feature = "no_std"))]
     #[cfg(not(target_family = "wasm"))]
     #[inline(always)]
-    pub fn consume_file(&self, path: std::path::PathBuf) -> RhaiResultOf<()> {
+    pub fn consume_file(&self, path: PathBuf) -> RhaiResultOf<()> {
         self.run_file(path)
     }
 
@@ -40,11 +41,7 @@ impl Engine {
     #[cfg(not(feature = "no_std"))]
     #[cfg(not(target_family = "wasm"))]
     #[inline(always)]
-    pub fn consume_file_with_scope(
-        &self,
-        scope: &mut Scope,
-        path: std::path::PathBuf,
-    ) -> RhaiResultOf<()> {
+    pub fn consume_file_with_scope(&self, scope: &mut Scope, path: PathBuf) -> RhaiResultOf<()> {
         self.run_file_with_scope(scope, path)
     }
 
diff --git a/src/api/files.rs b/src/api/files.rs
index 1cfd82a9..28272345 100644
--- a/src/api/files.rs
+++ b/src/api/files.rs
@@ -6,13 +6,12 @@ use crate::types::dynamic::Variant;
 use crate::{Engine, RhaiResultOf, Scope, AST, ERR};
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
+use std::{fs::File, io::Read, path::PathBuf};
 
 impl Engine {
     /// Read the contents of a file into a string.
-    fn read_file(path: std::path::PathBuf) -> RhaiResultOf<String> {
-        use std::io::Read;
-
-        let mut f = std::fs::File::open(path.clone()).map_err(|err| {
+    fn read_file(path: PathBuf) -> RhaiResultOf<String> {
+        let mut f = File::open(path.clone()).map_err(|err| {
             ERR::ErrorSystem(
                 format!("Cannot open script file '{}'", path.to_string_lossy()),
                 err.into(),
@@ -62,7 +61,7 @@ impl Engine {
     /// # }
     /// ```
     #[inline(always)]
-    pub fn compile_file(&self, path: std::path::PathBuf) -> RhaiResultOf<AST> {
+    pub fn compile_file(&self, path: PathBuf) -> RhaiResultOf<AST> {
         self.compile_file_with_scope(&Scope::new(), path)
     }
     /// Compile a script file into an [`AST`] using own scope, which can be used later for evaluation.
@@ -100,11 +99,7 @@ impl Engine {
     /// # }
     /// ```
     #[inline]
-    pub fn compile_file_with_scope(
-        &self,
-        scope: &Scope,
-        path: std::path::PathBuf,
-    ) -> RhaiResultOf<AST> {
+    pub fn compile_file_with_scope(&self, scope: &Scope, path: PathBuf) -> RhaiResultOf<AST> {
         Self::read_file(path).and_then(|contents| Ok(self.compile_with_scope(scope, &contents)?))
     }
     /// Evaluate a script file.
@@ -125,7 +120,7 @@ impl Engine {
     /// # }
     /// ```
     #[inline]
-    pub fn eval_file<T: Variant + Clone>(&self, path: std::path::PathBuf) -> RhaiResultOf<T> {
+    pub fn eval_file<T: Variant + Clone>(&self, path: PathBuf) -> RhaiResultOf<T> {
         Self::read_file(path).and_then(|contents| self.eval::<T>(&contents))
     }
     /// Evaluate a script file with own scope.
@@ -160,7 +155,7 @@ impl Engine {
     pub fn eval_file_with_scope<T: Variant + Clone>(
         &self,
         scope: &mut Scope,
-        path: std::path::PathBuf,
+        path: PathBuf,
     ) -> RhaiResultOf<T> {
         Self::read_file(path).and_then(|contents| self.eval_with_scope(scope, &contents))
     }
@@ -168,7 +163,7 @@ impl Engine {
     ///
     /// Not available under `no_std` or `WASM`.
     #[inline]
-    pub fn run_file(&self, path: std::path::PathBuf) -> RhaiResultOf<()> {
+    pub fn run_file(&self, path: PathBuf) -> RhaiResultOf<()> {
         Self::read_file(path).and_then(|contents| self.run(&contents))
     }
     /// Evaluate a file with own scope, returning any error (if any).
@@ -182,11 +177,7 @@ impl Engine {
     ///
     /// This allows functions to be optimized based on dynamic global constants.
     #[inline]
-    pub fn run_file_with_scope(
-        &self,
-        scope: &mut Scope,
-        path: std::path::PathBuf,
-    ) -> RhaiResultOf<()> {
+    pub fn run_file_with_scope(&self, scope: &mut Scope, path: PathBuf) -> RhaiResultOf<()> {
         Self::read_file(path).and_then(|contents| self.run_with_scope(scope, &contents))
     }
 }
diff --git a/src/api/limits.rs b/src/api/limits.rs
index 876a5f1b..18eb17f1 100644
--- a/src/api/limits.rs
+++ b/src/api/limits.rs
@@ -27,7 +27,7 @@ pub struct Limits {
     #[cfg(not(feature = "no_function"))]
     pub max_function_expr_depth: Option<NonZeroUsize>,
     /// Maximum number of operations allowed to run.
-    pub max_operations: Option<std::num::NonZeroU64>,
+    pub max_operations: Option<NonZeroU64>,
     /// Maximum number of [modules][crate::Module] allowed to load.
     ///
     /// Set to zero to effectively disable loading any [module][crate::Module].
diff --git a/src/ast/ast.rs b/src/ast/ast.rs
index 7e6f56c7..cd9f235f 100644
--- a/src/ast/ast.rs
+++ b/src/ast/ast.rs
@@ -8,6 +8,7 @@ use std::{
     fmt,
     hash::Hash,
     ops::{Add, AddAssign},
+    ptr,
 };
 
 /// Compiled AST (abstract syntax tree) of a Rhai script.
@@ -870,8 +871,8 @@ impl PartialEq for ASTNode<'_> {
     #[inline(always)]
     fn eq(&self, other: &Self) -> bool {
         match (self, other) {
-            (Self::Stmt(x), Self::Stmt(y)) => std::ptr::eq(*x, *y),
-            (Self::Expr(x), Self::Expr(y)) => std::ptr::eq(*x, *y),
+            (Self::Stmt(x), Self::Stmt(y)) => ptr::eq(*x, *y),
+            (Self::Expr(x), Self::Expr(y)) => ptr::eq(*x, *y),
             _ => false,
         }
     }
diff --git a/src/ast/expr.rs b/src/ast/expr.rs
index 6bad94a7..0f8a1562 100644
--- a/src/ast/expr.rs
+++ b/src/ast/expr.rs
@@ -17,7 +17,11 @@ use std::{
 };
 
 #[cfg(not(feature = "no_float"))]
-use std::str::FromStr;
+use std::{
+    hash::Hasher,
+    ops::{Deref, DerefMut},
+    str::FromStr,
+};
 
 #[cfg(not(feature = "no_float"))]
 use num_traits::float::FloatCore as Float;
@@ -230,7 +234,7 @@ pub struct FloatWrapper<F>(F);
 #[cfg(not(feature = "no_float"))]
 impl Hash for FloatWrapper<crate::FLOAT> {
     #[inline(always)]
-    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+    fn hash<H: Hasher>(&self, state: &mut H) {
         self.0.to_ne_bytes().hash(state);
     }
 }
@@ -252,7 +256,7 @@ impl<F: Float> AsMut<F> for FloatWrapper<F> {
 }
 
 #[cfg(not(feature = "no_float"))]
-impl<F: Float> std::ops::Deref for FloatWrapper<F> {
+impl<F: Float> Deref for FloatWrapper<F> {
     type Target = F;
 
     #[inline(always)]
@@ -262,7 +266,7 @@ impl<F: Float> std::ops::Deref for FloatWrapper<F> {
 }
 
 #[cfg(not(feature = "no_float"))]
-impl<F: Float> std::ops::DerefMut for FloatWrapper<F> {
+impl<F: Float> DerefMut for FloatWrapper<F> {
     #[inline(always)]
     fn deref_mut(&mut self) -> &mut Self::Target {
         &mut self.0
diff --git a/src/eval/debugger.rs b/src/eval/debugger.rs
index 5fc04e47..e0dd361e 100644
--- a/src/eval/debugger.rs
+++ b/src/eval/debugger.rs
@@ -6,7 +6,7 @@ use crate::ast::{ASTNode, Expr, Stmt};
 use crate::{Dynamic, Engine, EvalAltResult, Identifier, Module, Position, RhaiResultOf, Scope};
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
-use std::{fmt, mem};
+use std::{fmt, iter::repeat, mem};
 
 /// Callback function to initialize the debugger.
 #[cfg(not(feature = "sync"))]
@@ -160,10 +160,7 @@ impl fmt::Display for BreakPoint {
                     f,
                     "{} ({})",
                     fn_name,
-                    std::iter::repeat("_")
-                        .take(*args)
-                        .collect::<Vec<_>>()
-                        .join(", ")
+                    repeat("_").take(*args).collect::<Vec<_>>().join(", ")
                 )?;
                 if !*enabled {
                     f.write_str(" (disabled)")?;
diff --git a/src/eval/eval_state.rs b/src/eval/eval_state.rs
index b826ffd9..13acd9b5 100644
--- a/src/eval/eval_state.rs
+++ b/src/eval/eval_state.rs
@@ -2,10 +2,9 @@
 
 use crate::func::call::FnResolutionCache;
 use crate::StaticVec;
-use std::collections::BTreeMap;
-use std::marker::PhantomData;
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
+use std::{collections::BTreeMap, marker::PhantomData};
 
 /// _(internals)_ A type that holds all the current states of the [`Engine`][crate::Engine].
 /// Exported under the `internals` feature only.
diff --git a/src/func/register.rs b/src/func/register.rs
index 289dd8db..84d1d728 100644
--- a/src/func/register.rs
+++ b/src/func/register.rs
@@ -48,7 +48,7 @@ pub fn by_value<T: Variant + Clone>(data: &mut Dynamic) -> T {
         // # Safety
         //
         // We already checked that `T` is `&str`, so it is safe to cast here.
-        return unsafe { std::mem::transmute_copy::<_, T>(&ref_str) };
+        return unsafe { mem::transmute_copy::<_, T>(&ref_str) };
     }
     if TypeId::of::<T>() == TypeId::of::<String>() {
         // If T is `String`, data must be `ImmutableString`, so map directly to it
diff --git a/src/module/resolvers/collection.rs b/src/module/resolvers/collection.rs
index 57c2bbb1..fe03612f 100644
--- a/src/module/resolvers/collection.rs
+++ b/src/module/resolvers/collection.rs
@@ -1,7 +1,7 @@
 use crate::{Engine, Module, ModuleResolver, Position, RhaiResultOf, Shared, ERR};
-use std::ops::AddAssign;
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
+use std::{ops::AddAssign, vec::IntoIter};
 
 /// [Module] resolution service that holds a collection of module resolvers,
 /// to be searched in sequential order.
@@ -108,7 +108,7 @@ impl ModuleResolversCollection {
 
 impl IntoIterator for ModuleResolversCollection {
     type Item = Box<dyn ModuleResolver>;
-    type IntoIter = std::vec::IntoIter<Box<dyn ModuleResolver>>;
+    type IntoIter = IntoIter<Box<dyn ModuleResolver>>;
 
     #[inline(always)]
     fn into_iter(self) -> Self::IntoIter {
diff --git a/src/module/resolvers/stat.rs b/src/module/resolvers/stat.rs
index 5648b5ef..be9110a7 100644
--- a/src/module/resolvers/stat.rs
+++ b/src/module/resolvers/stat.rs
@@ -3,7 +3,7 @@ use crate::{
 };
 #[cfg(feature = "no_std")]
 use std::prelude::v1::*;
-use std::{collections::BTreeMap, ops::AddAssign};
+use std::{collections::btree_map::IntoIter, collections::BTreeMap, ops::AddAssign};
 
 /// A static [module][Module] resolution service that serves [modules][Module] added into it.
 ///
@@ -120,7 +120,7 @@ impl StaticModuleResolver {
 
 impl IntoIterator for StaticModuleResolver {
     type Item = (Identifier, Shared<Module>);
-    type IntoIter = std::collections::btree_map::IntoIter<SmartString, Shared<Module>>;
+    type IntoIter = IntoIter<SmartString, Shared<Module>>;
 
     fn into_iter(self) -> Self::IntoIter {
         self.0.into_iter()