use -r:off for runnableExamples that should compile but not run (#17203)

* use -r:off for runnableExamples that should compile but not run

* use -r:off in other RT disabled tests

lib/impure/rdstdin.nim

@@ -13,8 +13,7 @@
 ## is used. This suffices because Windows' console already provides the
 ## wanted functionality.
 
-runnableExamples:
+runnableExamples("-r:off"):
-  if false:
   echo readLineFromStdin("Is Nim awesome? (Y/n): ")
   var line: string
   while true:

lib/pure/asynchttpserver.nim

@@ -14,13 +14,11 @@
 ## application in production you should use a reverse proxy (for example nginx)
 ## instead of allowing users to connect directly to this server.
 
-runnableExamples:
+runnableExamples("-r:off"):
   # This example will create an HTTP server on port 8080. The server will
   # respond to all requests with a `200 OK` response code and "Hello World"
-  # as the response body. Run locally with:
+  # as the response body.
-  # `nim doc --doccmd:-d:nimAsyncHttpServerEnableTest --lib:lib lib/pure/asynchttpserver.nim`
   import std/asyncdispatch
-  if defined(nimAsyncHttpServerEnableTest):
   proc main {.async.} =
     const port = 8080
     var server = newAsyncHttpServer()

lib/pure/oids.nim

@@ -100,8 +100,8 @@ proc genOid*(): Oid =
   ## Generates a new OID.
   runnableExamples:
     doAssert ($genOid()).len == 24
-    if false: doAssert $genOid() == "5fc7f546ddbbc84800006aaf"
+  runnableExamples("-r:off"):
-
+    echo $genOid() # for example, "5fc7f546ddbbc84800006aaf"
   genOid(result, incr, fuzz)
 
 proc generatedTime*(oid: Oid): Time =

lib/pure/sugar.nim

@@ -168,11 +168,11 @@ macro dump*(x: untyped): untyped =
   ## See also: `dumpToString` which is more convenient and useful since
   ## it expands intermediate templates/macros, returns a string instead of
   ## calling `echo`, and works with statements and expressions.
-  runnableExamples:
+  runnableExamples("-r:off"):
     let
       x = 10
       y = 20
-    if false: dump(x + y) # if true would print `x + y = 30`
+    dump(x + y) # prints: `x + y = 30`
 
   let s = x.toStrLit
   result = quote do:

lib/wrappers/linenoise/linenoise.nim

@@ -58,8 +58,7 @@ when defined nimExperimentalLinenoiseExtra:
     ## line editing API that allows returning the line entered and an indicator
     ## of which control key was entered, allowing user to distinguish between
     ## for example ctrl-C vs ctrl-D.
-    runnableExamples("-d:nimExperimentalLinenoiseExtra"):
+    runnableExamples("-d:nimExperimentalLinenoiseExtra -r:off"):
-      if false:
       var ret: ReadLineResult
       while true:
         readLineStatus("name: ", ret) # ctrl-D will exit, ctrl-C will go to next prompt