From dc6058fb9b58fa2216fdf6db22462753d7a38cce Mon Sep 17 00:00:00 2001
From: metagn <metagngn@gmail.com>
Date: Sat, 16 Sep 2023 10:16:12 +0300
Subject: [PATCH] implement semgnrc for tuple and object type nodes (#22709)

fixes #22699

(cherry picked from commit 8836207a4e68c177d5059131df05a9d433dd3c8d)
---
 compiler/semgnrc.nim          | 43 +++++++++++++++++++++++++++++++++--
 tests/generics/mtypenodes.nim |  6 +++++
 tests/generics/timports.nim   |  6 ++++-
 3 files changed, 52 insertions(+), 3 deletions(-)
 create mode 100644 tests/generics/mtypenodes.nim

diff --git a/compiler/semgnrc.nim b/compiler/semgnrc.nim
index cbbb8cf556..a6cab96a1f 100644
--- a/compiler/semgnrc.nim
+++ b/compiler/semgnrc.nim
@@ -456,8 +456,47 @@ proc semGenericStmt(c: PContext, n: PNode,
         of nkIdent: a = n[i]
         else: illFormedAst(n, c.config)
         addDecl(c, newSymS(skUnknown, getIdentNode(c, a), c))
-  of nkObjectTy, nkTupleTy, nkTupleClassTy:
-    discard
+  of nkTupleTy:
+    for i in 0..<n.len:
+      var a = n[i]
+      case a.kind:
+      of nkCommentStmt, nkNilLit, nkSym, nkEmpty: continue
+      of nkIdentDefs:
+        checkMinSonsLen(a, 3, c.config)
+        a[^2] = semGenericStmt(c, a[^2], flags+{withinTypeDesc}, ctx)
+        a[^1] = semGenericStmt(c, a[^1], flags, ctx)
+        for j in 0..<a.len-2:
+          addTempDecl(c, getIdentNode(c, a[j]), skField)
+      else:
+        illFormedAst(a, c.config)
+  of nkObjectTy:
+    if n.len > 0:
+      openScope(c)
+      for i in 0..<n.len:
+        result[i] = semGenericStmt(c, n[i], flags, ctx)
+      closeScope(c)
+  of nkRecList:
+    for i in 0..<n.len:
+      var a = n[i]
+      case a.kind:
+      of nkCommentStmt, nkNilLit, nkSym, nkEmpty: continue
+      of nkIdentDefs:
+        checkMinSonsLen(a, 3, c.config)
+        a[^2] = semGenericStmt(c, a[^2], flags+{withinTypeDesc}, ctx)
+        a[^1] = semGenericStmt(c, a[^1], flags, ctx)
+        for j in 0..<a.len-2:
+          addTempDecl(c, getIdentNode(c, a[j]), skField)
+      of nkRecCase, nkRecWhen:
+        n[i] = semGenericStmt(c, a, flags, ctx)
+      else:
+        illFormedAst(a, c.config)
+  of nkRecCase:
+    checkSonsLen(n[0], 3, c.config)
+    n[0][^2] = semGenericStmt(c, n[0][^2], flags+{withinTypeDesc}, ctx)
+    n[0][^1] = semGenericStmt(c, n[0][^1], flags, ctx)
+    addTempDecl(c, getIdentNode(c, n[0][0]), skField)
+    for i in 1..<n.len:
+      n[i] = semGenericStmt(c, n[i], flags, ctx)
   of nkFormalParams:
     checkMinSonsLen(n, 1, c.config)
     for i in 1..<n.len:
diff --git a/tests/generics/mtypenodes.nim b/tests/generics/mtypenodes.nim
new file mode 100644
index 0000000000..e1132241bf
--- /dev/null
+++ b/tests/generics/mtypenodes.nim
@@ -0,0 +1,6 @@
+# issue #22699
+
+type Private = distinct int
+
+proc chop*[T](x: int): int =
+  cast[int](cast[tuple[field: Private]](x))
diff --git a/tests/generics/timports.nim b/tests/generics/timports.nim
index 6b71cb6d3b..e252ad1947 100644
--- a/tests/generics/timports.nim
+++ b/tests/generics/timports.nim
@@ -7,7 +7,7 @@ false
 '''
 """
 
-import mbind_bracket, mclosed_sym, mdotlookup, mmodule_same_as_proc
+import mbind_bracket, mclosed_sym, mdotlookup, mmodule_same_as_proc, mtypenodes
 
 
 block tbind_bracket:
@@ -57,3 +57,7 @@ block tmodule_same_as_proc:
   proc test[T](t: T) =
     mmodule_same_as_proc"a"
   test(0)
+
+block ttypenodes:
+  # issue #22699
+  doAssert chop[bool](42) == 42