From d56000eaff324cf4b0d830c8a1a0b94c12abc823 Mon Sep 17 00:00:00 2001
From: metagn <metagngn@gmail.com>
Date: Tue, 19 Sep 2023 10:14:55 +0300
Subject: [PATCH] make parseEnum skip type aliases for enum type sym (#22727)

fixes #22726

(cherry picked from commit 51cb493b221e704efce126049f9f320eb1cb1a36)
---
 lib/std/enumutils.nim      |  3 ++-
 tests/stdlib/tstrutils.nim | 19 +++++++++++++++----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/lib/std/enumutils.nim b/lib/std/enumutils.nim
index 0386c2589f..1ce82eccf2 100644
--- a/lib/std/enumutils.nim
+++ b/lib/std/enumutils.nim
@@ -22,7 +22,8 @@ macro genEnumCaseStmt*(typ: typedesc, argSym: typed, default: typed,
   # a normalized string comparison to the `argSym` input.
   # string normalization is done using passed normalizer.
   let typ = typ.getTypeInst[1]
-  let impl = typ.getImpl[2]
+  let typSym = typ.getTypeImpl.getTypeInst # skip aliases etc to get type sym
+  let impl = typSym.getImpl[2]
   expectKind impl, nnkEnumTy
   let normalizerNode = quote: `normalizer`
   expectKind normalizerNode, nnkSym
diff --git a/tests/stdlib/tstrutils.nim b/tests/stdlib/tstrutils.nim
index 847e226560..9cc65f218b 100644
--- a/tests/stdlib/tstrutils.nim
+++ b/tests/stdlib/tstrutils.nim
@@ -679,11 +679,22 @@ template main() =
       doAssert b == f2
       doAssert c == f3
 
-  block: # parseEnum TODO: merge above
-    type MyEnum = enum enA, enB, enC, enuD, enE
-    doAssert parseEnum[MyEnum]("enu_D") == enuD
+    block:
+      type MyEnum = enum enA, enB, enC, enuD, enE
+      doAssert parseEnum[MyEnum]("enu_D") == enuD
 
-    doAssert parseEnum("invalid enum value", enC) == enC
+      doAssert parseEnum("invalid enum value", enC) == enC
+    
+    block: # issue #22726
+      type SomeEnum = enum A, B, C
+
+      proc assignEnum(dest: var enum, s: string) =
+        type ty = typeof(dest)
+        dest = parseEnum[ty](s)
+      
+      var v: SomeEnum
+      v.assignEnum("A")
+      doAssert v == A
 
   block: # indentation
     doAssert 0 == indentation """