Repair Proc#parameters to return no names for proc created with Symbol#to_proc

Author: andrykonchin

src/main/java/org/truffleruby/core/proc/RubyProc.java

@@ -123,6 +123,7 @@ public int getArityNumber() {
     }
 
     public ArgumentDescriptor[] getArgumentDescriptors() {
+        // parameters can be unnamed in a Proc created using Symbol#to_proc
         return argumentDescriptors == null ? arity.toUnnamedArgumentDescriptors() : argumentDescriptors;
     }
 

src/main/java/org/truffleruby/core/symbol/SymbolNodes.java

@@ -226,7 +226,7 @@ public static RootCallTarget createCallTarget(RubyLanguage language, RubySymbol
                     0,
                     "&:" + symbol.getString(),
                     "Symbol#to_proc",
-                    ArgumentDescriptor.AT_LEAST_ONE);
+                    ArgumentDescriptor.AT_LEAST_ONE_UNNAMED);
 
             // ModuleNodes.DefineMethodNode relies on the lambda CallTarget to always use a RubyLambdaRootNode,
             // and we want to use a single CallTarget for both proc and lambda.

src/main/java/org/truffleruby/parser/ArgumentDescriptor.java

@@ -37,9 +37,9 @@ public final class ArgumentDescriptor {
     public final String name;
 
     public static final ArgumentDescriptor[] ANY_UNNAMED = { new ArgumentDescriptor(ArgumentType.unnamedrest) };
-    public static final ArgumentDescriptor[] AT_LEAST_ONE = {
-            new ArgumentDescriptor(ArgumentType.anonreq),
-            new ArgumentDescriptor(ArgumentType.anonrest) };
+    public static final ArgumentDescriptor[] AT_LEAST_ONE_UNNAMED = {
+            new ArgumentDescriptor(ArgumentType.unnamedreq),
+            new ArgumentDescriptor(ArgumentType.unnamedrest) };
     public static final ArgumentDescriptor[] EMPTY_ARRAY = new ArgumentDescriptor[0];
 
     public ArgumentDescriptor(ArgumentType type, String name) {