fix scoping of single-item generate conditionals

src/Convert/Scoper.hs

@@ -361,16 +361,13 @@ evalScoperT declMapper moduleItemMapper genItemMapper stmtMapper topName items =
                     let genItems = map GenModuleItem injected' ++ [genItem'']
                     return $ GenBlock "" genItems
         scopeGenItemMapper :: GenItem -> ScoperT a m GenItem
-        scopeGenItemMapper (GenFor (index, a) b c (GenBlock name genItems)) = do
-            enterScope name index
-            genItems' <- mapM fullGenItemMapper genItems
-            exitScope name index
-            return $ GenFor (index, a) b c (GenBlock name genItems')
         scopeGenItemMapper (GenFor (index, a) b c genItem) = do
-            enterScope "" index
-            genItem' <- fullGenItemMapper genItem
-            exitScope "" index
+            genItem' <- scopeGenItemBranchMapper index genItem
             return $ GenFor (index, a) b c genItem'
+        scopeGenItemMapper (GenIf cond thenItem elseItem) = do
+            thenItem' <- scopeGenItemBranchMapper "" thenItem
+            elseItem' <- scopeGenItemBranchMapper "" elseItem
+            return $ GenIf cond thenItem' elseItem'
         scopeGenItemMapper (GenBlock name genItems) = do
             enterScope name ""
             genItems' <- mapM fullGenItemMapper genItems
@@ -381,6 +378,18 @@ evalScoperT declMapper moduleItemMapper genItemMapper stmtMapper topName items =
         scopeGenItemMapper genItem =
             traverseSinglyNestedGenItemsM fullGenItemMapper genItem
 
+        scopeGenItemBranchMapper :: Identifier -> GenItem -> ScoperT a m GenItem
+        scopeGenItemBranchMapper index (GenBlock name genItems) = do
+            enterScope name index
+            genItems' <- mapM fullGenItemMapper genItems
+            exitScope name index
+            return $ GenBlock name genItems'
+        scopeGenItemBranchMapper index genItem = do
+            enterScope "" index
+            genItem' <- fullGenItemMapper genItem
+            exitScope "" index
+            return genItem'
+
 partScoper
     :: MapperM (Scoper a) Decl
     -> MapperM (Scoper a) ModuleItem

test/basic/generate_if_scope.sv

+module top;
+    parameter WIDTH = 5;
+    logic [WIDTH-1:0] x, y;
+    if (WIDTH > 0)
+        initial
+            x = WIDTH'(0);
+    initial
+        y = WIDTH'(0);
+endmodule

test/basic/generate_if_scope.v

+module top;
+    parameter WIDTH = 5;
+    reg [WIDTH-1:0] x, y;
+    if (WIDTH > 0)
+        initial
+            x = 0;
+    initial
+        y = 0;
+endmodule