fixes #12642 (#18811)

* fixes #12642

* update important packages; refs #18804

* fixes #18805; refs #18806

* fixes a regression

* Update testament/categories.nim

Co-authored-by: flywind <xzsflywind@gmail.com>

* progress

* progress

Co-authored-by: flywind <xzsflywind@gmail.com>

tests/effects/teffects6.nim

@@ -34,3 +34,23 @@ proc use*() =
 
 
 use()
+
+# bug #12642
+import os
+
+proc raises() {.raises: Exception.} = discard
+proc harmless() {.raises: [].} = discard
+
+let x = if paramStr(1) == "true": harmless else: raises
+
+let
+  choice = 0
+
+proc withoutSideEffects(): int = 0
+proc withSideEffects(): int = echo "foo" # the echo causes the side effect
+
+let procPtr = case choice
+              of 0: withoutSideEffects
+              else: withSideEffects
+
+echo procPtr.repr