test removing dollar for objects out of system (#20242)

* test removing dollar for objects out of system

* test & fixes

* fix bootstrap

* use nimPreviewSlimSystem, test stdlib category

* fix test

tests/stdlib/tobjectdollar.nim

@@ -0,0 +1,14 @@
+discard """
+  matrix: "-d:nimPreviewSlimSystem"
+"""
+
+import std/assertions
+
+type Foo = object
+  a, b: int
+
+let x = Foo(a: 23, b: 45)
+doAssert not compiles($x)
+import std/objectdollar
+doAssert compiles($x)
+doAssert $x == "(a: 23, b: 45)"

tests/stdlib/toptions.nim

@@ -4,6 +4,9 @@ discard """
 
 import std/[json, options]
 
+when defined(nimPreviewSlimSystem):
+  import std/objectdollar
+
 
 # RefPerson is used to test that overloaded `==` operator is not called by
 # options. It is defined here in the global scope, because otherwise the test

tests/stdlib/tstrformat.nim

@@ -3,6 +3,9 @@
 import genericstrformat
 import std/[strformat, strutils, times, tables, json]
 
+when defined(nimPreviewSlimSystem):
+  import std/objectdollar
+
 proc main() =
   block: # issue #7632
     doAssert works(5) == "formatted  5"