Fixed some glitches from last refactoring

Src/AST/Myc.Ast.Compiler.Binder.pas

@@ -34,7 +34,7 @@ type
         FFunctionRegistry: IFunctionDefinitionRegistry;
         FBoxedDeclarations: THashSet<IVariableDeclarationNode>;
 
-        // Fix for TExecutionScope parent chain optimization
+        // Counts lambdas encountered to determine if a lambda has nested children
         FLambdaCounter: Integer;
 
         function IsValidIdentifier(const Name: string): Boolean;
@@ -157,12 +157,17 @@ var
 begin
     if Name.IsEmpty then
         exit(False);
-    c := Name[1];
-    if not (c.IsLetter or (c = '_')) then
-        exit(False);
+
+    // Support standard identifiers and hygienic macro names (e.g. loop#1)
     for c in Name do
-        if not (c.IsLetterOrDigit or (c = '_') or (c = '-')) then
+        if not (c.IsLetterOrDigit or (c = '_') or (c = '-') or (c = '#')) then
             exit(False);
+
+    // First char check (cannot be digit unless it's a pure number which is tokenized differently)
+    c := Name[1];
+    if not (c.IsLetter or (c = '_') or (c = '#')) then
+        exit(False);
+
     Result := True;
 end;
 
@@ -172,6 +177,7 @@ var
     depth: Integer;
     slot: Integer;
 begin
+    // Start search in current builder
     layout := FCurrentBuilder;
     depth := 0;
 
@@ -230,10 +236,12 @@ begin
 
         if physAddr.ScopeDepth > 0 then
         begin
+            // It's an upvalue (from a parent scope). Capture it.
             upvalueIndex := CaptureUpvalue(physAddr);
             Result := TAst.Identifier(Node.Name, TResolvedAddress.Create(akUpvalue, 0, upvalueIndex), TTypes.Unknown);
         end
         else
+            // It's local.
             Result := TAst.Identifier(Node.Name, physAddr, TTypes.Unknown);
     end
     else
@@ -301,10 +309,11 @@ var
     startCount: Integer;
     hasNested: Boolean;
 begin
-    // Count logic: Measure how many lambdas are visited inside this one.
+    // 1. Count logic to determine if this lambda has nested lambdas
     startCount := FLambdaCounter;
-    Inc(FLambdaCounter); // Count self
+    Inc(FLambdaCounter); // Count myself
 
+    // 2. Push Scope
     parentBuilder := FCurrentBuilder;
     FCurrentBuilder := TScope.CreateBuilder(parentBuilder);
 
@@ -355,7 +364,8 @@ begin
         FUpvalueStack.Pop;
     end;
 
-    // Calculate HasNested: If counter increased by more than 1 (self), we have children.
+    // 3. Calculate hasNested
+    // If FLambdaCounter increased by more than just 1 (myself), children were visited.
     hasNested := FLambdaCounter > (startCount + 1);
 
     Result := TAst.LambdaExpr(newParams, newBody, finalLayout, nil, upvaluesList, hasNested);