From 344feb0dd14df21ad05f4b73be371eec0f3419df Mon Sep 17 00:00:00 2001
From: SirOlaf <34164198+SirOlaf@users.noreply.github.com>
Date: Sun, 17 Sep 2023 20:03:43 +0200
Subject: [PATCH] Fix #22713: Make size unknown for tyForward (#22714)

Close #22713

---------

Co-authored-by: SirOlaf <>
(cherry picked from commit fcf4c1ae172080b8ef00b173977c223836bdebf2)
---
 compiler/sizealignoffsetimpl.nim |  7 +++----
 tests/pragmas/t22713.nim         | 12 ++++++++++++
 2 files changed, 15 insertions(+), 4 deletions(-)
 create mode 100644 tests/pragmas/t22713.nim

diff --git a/compiler/sizealignoffsetimpl.nim b/compiler/sizealignoffsetimpl.nim
index e07d55fbcd..7b0fa8732c 100644
--- a/compiler/sizealignoffsetimpl.nim
+++ b/compiler/sizealignoffsetimpl.nim
@@ -433,10 +433,9 @@ proc computeSizeAlign(conf: ConfigRef; typ: PType) =
     typ.paddingAtEnd = typ.base.paddingAtEnd
 
   of tyForward:
-    # is this really illegal recursion, or maybe just unknown?
-    typ.size = szIllegalRecursion
-    typ.align = szIllegalRecursion
-    typ.paddingAtEnd = szIllegalRecursion
+    typ.size = szUnknownSize
+    typ.align = szUnknownSize
+    typ.paddingAtEnd = szUnknownSize
 
   of tyStatic:
     if typ.n != nil:
diff --git a/tests/pragmas/t22713.nim b/tests/pragmas/t22713.nim
new file mode 100644
index 0000000000..3d3384632f
--- /dev/null
+++ b/tests/pragmas/t22713.nim
@@ -0,0 +1,12 @@
+import std/macros
+
+
+template myPragma(x: int) {.pragma.}
+
+type
+  A = object
+    x: int64
+
+  B {.myPragma(sizeof(A)).} = object
+
+doAssert B.getCustomPragmaVal(myPragma) == 8
\ No newline at end of file