diff --git a/source/poodinis/altphobos.d b/source/poodinis/altphobos.d
new file mode 100644
index 0000000..be91948
--- /dev/null
+++ b/source/poodinis/altphobos.d
@@ -0,0 +1,44 @@
+/**
+ * Tweaks to Phobos's standard templates.
+ *
+ * Implementations copied and adapted from std.traits;
+ *
+ * Authors: $(HTTP erdani.org, Andrei Alexandrescu),
+ *            Jonathan M Davis,
+ *            $(HTTP digitalmars.com, Walter Bright),
+ *            Tomasz Stachowiak ($(D isExpressions)),
+ *            $(HTTP erdani.org, Andrei Alexandrescu),
+ *            Shin Fujishiro,
+ *            $(HTTP octarineparrot.com, Robert Clipsham),
+ *            $(HTTP klickverbot.at, David Nadlinger),
+ *            Kenji Hara,
+ *            Shoichi Kato,
+ *            Mike Bierlee (m.bierlee@lostmoment.com)
+ * Copyright: Copyright Digital Mars 2005 - 2009., Copyright Andrei Alexandrescu 2008-, Jonathan M Davis 2011-., 2014-2021 Mike Bierlee
+ * License:  $(HTTP boost.org/LICENSE_1_0.txt, Boost License 1.0)
+ */
+
+module poodinis.altphobos;
+
+template isFunction(X...)
+{
+    static if (X.length == 1)
+    {
+        static if (is(typeof(&X[0]) U : U*) && is(U == function) || is(typeof(&X[0]) U == delegate))
+        {
+            // x is a (nested) function symbol.
+            enum isFunction = true;
+        }
+        else static if (is(X[0] T))
+        {
+            // x is a type.  Take the type of it and examine.
+            enum isFunction = is(T == function);
+        }
+        else
+            enum isFunction = false;
+    }
+    else
+    {
+        enum isFunction = false;
+    }
+}
diff --git a/source/poodinis/autowire.d b/source/poodinis/autowire.d
index bc3bd1d..98994d0 100644
--- a/source/poodinis/autowire.d
+++ b/source/poodinis/autowire.d
@@ -21,14 +21,17 @@ import poodinis.container;
 import poodinis.registration;
 import poodinis.factory;
 import poodinis.valueinjection;
-import poodinis.polyfill;
+import poodinis.altphobos : isFunction;
 import poodinis.imports;
 
-import std.exception;
-import std.stdio;
-import std.string;
-import std.traits;
-import std.range;
+import std.exception : enforce;
+import std.string : format;
+import std.traits : BaseClassesTuple, FieldNameTuple, fullyQualifiedName, hasUDA, isDynamicArray;
+import std.range : ElementType;
+
+debug {
+    import std.stdio : writeln;
+}
 
 private struct UseMemberType {}
 
@@ -92,7 +95,9 @@ struct OptionalDependency {}
 struct AssignNewInstance {}
 
 private void printDebugAutowiredInstance(TypeInfo instanceType, void* instanceAddress) {
-    writeln(format("DEBUG: Autowiring members of [%s@%s]", instanceType, instanceAddress));
+    debug {
+        writeln(format("DEBUG: Autowiring members of [%s@%s]", instanceType, instanceAddress));
+    }
 }
 
 /**
@@ -121,11 +126,15 @@ public void autowire(Type)(shared(DependencyContainer) container, Type instance)
 }
 
 private void printDebugAutowiringCandidate(TypeInfo candidateInstanceType, void* candidateInstanceAddress, TypeInfo instanceType, void* instanceAddress, string member) {
-    writeln(format("DEBUG: Autowired instance [%s@%s] to [%s@%s].%s", candidateInstanceType, candidateInstanceAddress, instanceType, instanceAddress, member));
+    debug {
+        writeln(format("DEBUG: Autowired instance [%s@%s] to [%s@%s].%s", candidateInstanceType, candidateInstanceAddress, instanceType, instanceAddress, member));
+    }
 }
 
 private void printDebugAutowiringArray(TypeInfo superTypeInfo, TypeInfo instanceType, void* instanceAddress, string member) {
-    writeln(format("DEBUG: Autowired all registered instances of super type %s to [%s@%s].%s", superTypeInfo, instanceType, instanceAddress, member));
+    debug {
+        writeln(format("DEBUG: Autowired all registered instances of super type %s to [%s@%s].%s", superTypeInfo, instanceType, instanceAddress, member));
+    }
 }
 
 private void autowireMember(string member, size_t memberIndex, Type)(shared(DependencyContainer) container, Type instance) {
@@ -227,7 +236,9 @@ private void injectValue(string member, size_t memberIndex, string key, bool man
 }
 
 private void printDebugValueInjection(TypeInfo instanceType, void* instanceAddress, string member, TypeInfo valueType, string key) {
-    writeln(format("DEBUG: Injected value with key '%s' of type %s into [%s@%s].%s", key, valueType, instanceType, instanceAddress, member));
+    debug {
+        writeln(format("DEBUG: Injected value with key '%s' of type %s into [%s@%s].%s", key, valueType, instanceType, instanceAddress, member));
+    }
 }
 
 /**
diff --git a/source/poodinis/container.d b/source/poodinis/container.d
index a25d838..f43313b 100644
--- a/source/poodinis/container.d
+++ b/source/poodinis/container.d
@@ -18,13 +18,12 @@ import poodinis.autowire;
 import poodinis.context;
 import poodinis.factory;
 import poodinis.valueinjection;
-import poodinis.polyfill;
+import poodinis.altphobos : isFunction;
 import poodinis.imports;
 
-import std.string;
-import std.algorithm;
-import std.concurrency;
-import std.traits;
+import std.string : format;
+import std.algorithm: canFind;
+import std.traits : fullyQualifiedName, hasUDA, BaseTypeTuple;
 import std.meta : AliasSeq;
 
 debug {
diff --git a/source/poodinis/polyfill.d b/source/poodinis/polyfill.d
index e5a5813..a9ef1fe 100644
--- a/source/poodinis/polyfill.d
+++ b/source/poodinis/polyfill.d
@@ -42,25 +42,3 @@ static if (!__traits(compiles, basicExceptionCtors)) {
         }
     }
 }
-
-static if (!__traits(compiles, isFunction)) {
-    template isFunction(X...) 
-    {
-        static if (X.length > 1) {
-            enum isFunction = false;
-        } else
-        static if (is(typeof(&X[0]) U : U*) && is(U == function) ||
-                    is(typeof(&X[0]) U == delegate))
-        {
-            // x is a (nested) function symbol.
-            enum isFunction = true;
-        }
-        else static if (is(X[0] T))
-        {
-            // x is a type.  Take the type of it and examine.
-            enum isFunction = is(T == function);
-        }
-        else
-            enum isFunction = false;
-    }
-}