Fix named argument handling

Instead of trying to use the whole parameter, it uses just the RHS, as expected

lib/pure/unittest.nim

@@ -149,10 +149,19 @@ macro check*(conditions: stmt): stmt {.immediate.} =
         inc counter
         var arg = newIdentNode(":p" & $counter)
         var argStr = exp[i].toStrLit
+        var paramAst = exp[i]
         if exp[i].kind in nnkCallKinds: inspectArgs(exp[i])
-        argsAsgns.add getAst(asgn(arg, exp[i]))
+        if exp[i].kind == nnkExprEqExpr:
+          # ExprEqExpr
+          #   Ident !"v"
+          #   IntLit 2
+          paramAst = exp[i][1]
+        argsAsgns.add getAst(asgn(arg, paramAst))
         argsPrintOuts.add getAst(print(argStr, arg))
-        exp[i] = arg
+        if exp[i].kind != nnkExprEqExpr:
+          exp[i] = arg
+        else:
+          exp[i][1] = arg
 
   case checked.kind
   of nnkCallKinds: