typetraits: fixes #6454; genericParams; added lenTuple; added tuple type get (#13064)

2020-01-09 23:51:37 -08:00 · 2020-01-09 23:51:37 -08:00 · 4cd86c0842
commit 4cd86c0842
parent fcd2f305ad
4 changed files with 60 additions and 4 deletions
--- a/lib/system/inclrtl.nim
+++ b/lib/system/inclrtl.nim
@ -50,5 +50,7 @@ else:
  {.pragma: benign, gcsafe.}

 template since(version, body: untyped) {.dirty.} =
+  ## limitation: can't be used to annotate a template (eg typetraits.get), would
+  ## error: cannot attach a custom pragma.
  when version <= (NimMajor, NimMinor):
    body