CLJCLR-179: Fix spec.alpha library loading to avoid double loading and inclusion of constants from those files in other compiled files.

Author: dmiller

Clojure/Clojure/CljCompiler/Compiler.cs

@@ -1289,6 +1289,9 @@ public static Var EnsureMacroCheck()
             {
                 lock (MacroCheckLock)
                 {
+                    // See if it is already loaded.  (most likely true)
+                    MacroCheckVar = Var.find(Symbol.intern("clojure.spec.alpha", "macroexpand-check"));
+
                     if (MacroCheckVar == null)
                     {
                         MacroCheckLoading = true;

Clojure/Clojure/Lib/RT.cs

@@ -479,12 +479,12 @@ public static void LoadSpecCode()
             try
             {
                 Var.pushThreadBindings(RT.map(Compiler.CompileFilesVar, false));
-                // We need to prevent loading more than once.
-                IFn require = clojure.clr.api.Clojure.var("clojure.core", "require");
-                require.invoke(clojure.clr.api.Clojure.read("clojure.spec.alpha"));
-                require.invoke(clojure.clr.api.Clojure.read("clojure.core.specs.alpha"));
-                //load("clojure/spec/alpha");
-                //load("clojure/core/specs/alpha");
+                //// We need to prevent loading more than once.
+                //IFn require = clojure.clr.api.Clojure.var("clojure.core", "require");
+                //require.invoke(clojure.clr.api.Clojure.read("clojure.spec.alpha"));
+                //require.invoke(clojure.clr.api.Clojure.read("clojure.core.specs.alpha"));
+                load("clojure/spec/alpha");
+                load("clojure/core/specs/alpha");
             }
             finally
             {