diff --git a/internal/adi.d b/internal/adi.d
index a97744ebc..2c86cb972 100644
--- a/internal/adi.d
+++ b/internal/adi.d
@@ -207,7 +207,7 @@ extern (C) long _adDupBit(Array a)
 	size = (a.length + 31) / 32;
 	r.ptr = cast(void *) new uint[size];
 	r.length = a.length;
-	memcpy(r.ptr, a.ptr, size);
+	memcpy(r.ptr, a.ptr, size * uint.sizeof);
 	return *cast(long*)(&r);
     }
 
diff --git a/internal/gc/gc.d b/internal/gc/gc.d
index b637b4124..45b0d4dc7 100644
--- a/internal/gc/gc.d
+++ b/internal/gc/gc.d
@@ -405,7 +405,7 @@ long _d_arrayappend(Array *px, byte[] y, uint size)
 	px.data = newdata;
     }
     px.length = newlength;
-    px.data[length * size .. newlength * size] = y[];
+    memcpy(px.data + length * size, y, y.length * size);
     return *cast(long*)px;
 }
 
diff --git a/std/array.d b/std/array.d
index 62a55508d..c700ed9a9 100644
--- a/std/array.d
+++ b/std/array.d
@@ -16,9 +16,9 @@ class ArrayBoundsError : Error
 	this.filename = filename;
 
 	char[] buffer = new char[19 + filename.length + linnum.sizeof * 3 + 1];
-	int length;
-	length = sprintf(buffer, "ArrayBoundsError %.*s(%u)", filename, linnum);
-	super(buffer[0..length]);
+	int len;
+	len = sprintf(buffer, "ArrayBoundsError %.*s(%u)", filename, linnum);
+	super(buffer[0..len]);
     }
 }
 
diff --git a/std/loader.d b/std/loader.d
index eeff42563..27e7df7f9 100644
--- a/std/loader.d
+++ b/std/loader.d
@@ -93,7 +93,7 @@ version(Windows)
         alias HMODULE HModule_;
     }
 }
-else version(Linux)
+else version(linux)
 {
     extern(C)
     {
@@ -282,7 +282,7 @@ version(Windows)
         return szFileName[0 .. cch].dup;
     }
 }
-else version(Linux)
+else version(linux)
 {
     private class ExeModuleInfo
     {
diff --git a/std/switcherr.d b/std/switcherr.d
index 938aa6b29..6d99a112a 100644
--- a/std/switcherr.d
+++ b/std/switcherr.d
@@ -1,7 +1,9 @@
 
 module std.switcherr;
 
-class SwitchError : Object
+import std.stdio;
+
+class SwitchError : Error
 {
   private:
 
@@ -12,8 +14,13 @@ class SwitchError : Object
     {
 	this.linnum = linnum;
 	this.filename = filename;
+
+	char[] buffer = new char[17 + filename.length + linnum.sizeof * 3 + 1];
+	int len = sprintf(buffer, "Switch Default %.*s(%u)", filename, linnum);
+	super(buffer[0..len]);
     }
 
+
   public:
 
     /***************************************