use repeats for converted unbased-unsized literals

- reduces the number of cast functions which are generated
- adjust package_function_cast to preserve cast converage
- fix issue where cast functions would be generated before localparam
  substitution within a procedure

src/Convert/SizeCast.hs

@@ -31,7 +31,10 @@ traverseDeclM decl = do
             if isPrefixOf "sv2v_cast_" x && details /= Nothing
                 then return $ Variable Local DuplicateTag x [] Nil
                 else insertElem x t >> return decl
-        Param    _ t x   _ -> insertElem x t >> return decl
+        Param    _ t x   _ -> do
+            inProcedure <- withinProcedureM
+            when (not inProcedure) $ insertElem x t
+            return decl
         ParamType    _ _ _ -> return decl
         CommentDecl      _ -> return decl
     traverseDeclExprsM traverseExprM decl'

src/Convert/UnbasedUnsized.hs

@@ -102,7 +102,7 @@ convertModuleItemM (Instance moduleName params instanceName [] bindings) = do
             expr'' <- traverseNestedExprsM (replaceBindingExpr port) expr'
             return (portName, expr'')
         replaceBindingExpr :: Port -> Expr -> Writer Binds Expr
-        replaceBindingExpr port (orig @ (Cast Right{} (ConvertedUU a b))) = do
+        replaceBindingExpr port (orig @ (Repeat _ [ConvertedUU a b])) = do
             let ch = charForBit a b
             if orig == sizedLiteralFor tag ch
                 then do
@@ -141,7 +141,7 @@ charForBit _ _ = error "charForBit invariant violated"
 
 sizedLiteralFor :: Expr -> Char -> Expr
 sizedLiteralFor expr ch =
-    Cast (Right size) (literalFor ch)
+    Repeat size [literalFor ch]
     where size = DimsFn FnBits $ Right expr
 
 convertAsgn :: (LHS, Expr) -> (LHS, Expr)

test/basic/package_function_cast.sv

 package P;
     function automatic logic [7:0] f(input logic [2:0] p);
         logic [7:0] r;
-        r = '0;
-        r[p+:2] = '1;
+        localparam T = $bits(r[7:0]);
+        r = T'(1'sb0);
+        r[p+:2] = $bits(r[p+:2])'(1'sb1);
         return r;
     endfunction
 endpackage