lots of small changes

tests/generics/tbintree.nim

@@ -81,7 +81,7 @@ proc debug[T](a: PBinaryTree[T]) =
     echo a.data
     debug(a.ri)
 
-when isMainModule:
+when true:
   var
     root: PBinaryTree[string]
     x = newNode("hello")

tests/generics/toverloading_typedesc.nim

@@ -10,7 +10,7 @@ type
   LBar = object
 
 
-when isMainModule:
+when true:
   doAssert FBar.new() == 3
 
   proc new(_: typedesc[LFoo]): int = 0

tests/generics/tthread_generic.nim

@@ -26,7 +26,7 @@ proc `@||->`*[T](fn: proc(): T {.thread.},
 proc `||->`*[T](fn: proc(): T{.thread.}, callback: proc(val: T){.thread.}) =
   discard fn @||-> callback
 
-when isMainModule:
+when true:
   import os
   proc testFunc(): int {.thread.} =
     return 1

tests/generics/twrong_floatlit_type.nim

@@ -108,7 +108,7 @@ proc `/`*[S](a, b: Vector2D[S]): Vector2D[S] =
 proc vec[S](x, y: S): Vector2D[S] =
   Vector2D[S](x: x, y: y)
 
-if isMainModule:
+if true:
   # Comment out this let, and the program will fail to
   # compile with a type mismatch, as expected.