move since from inclrtl to std/private/since (#14188)

* move since from inclrtl to std/private/since
* move since import in system below for HCR

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/std/private/since.nim b/lib/std/private/since.nim
new file mode 100644
index 000000000..e4aecb61a
--- /dev/null
+++ b/lib/std/private/since.nim
@@ -0,0 +1,19 @@
+template since*(version: (int, int), body: untyped) {.dirty.} =
+  ## Evaluates `body` if the ``(NimMajor, NimMinor)`` is greater than
+  ## or equal to `version`. Usage:
+  ##
+  ## .. code-block:: Nim
+  ##   proc fun*() {.since: (1, 3).}
+  ##   since (1, 3): fun()
+  when (NimMajor, NimMinor) >= version:
+    body
+
+template since*(version: (int, int, int), body: untyped) {.dirty.} =
+  ## Evaluates `body` if ``(NimMajor, NimMinor, NimPatch)`` is greater than 
+  ## or equal to `version`. Usage:
+  ##
+  ## .. code-block:: Nim
+  ##   proc fun*() {.since: (1, 3, 1).}
+  ##   since (1, 3, 1): fun()
+  when (NimMajor, NimMinor, NimPatch) >= version:
+    body
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