fixes #5285

compiler/ast.nim

@@ -1541,7 +1541,8 @@ proc skipGenericOwner*(s: PSym): PSym =
   ## Generic instantiations are owned by their originating generic
   ## symbol. This proc skips such owners and goes straight to the owner
   ## of the generic itself (the module or the enclosing proc).
-  result = if s.kind in skProcKinds and sfFromGeneric in s.flags:
+  result = if s.kind in skProcKinds and {sfGenSym, sfFromGeneric} * s.flags ==
+                                                  {sfFromGeneric}:
              s.owner.owner
            else:
              s.owner

compiler/seminst.nim

@@ -97,10 +97,17 @@ proc genericCacheGet(genericSym: PSym, entry: TInstantiation;
       if inst.compilesId == id and sameInstantiation(entry, inst[]):
         return inst.sym
 
+when false:
+  proc `$`(x: PSym): string =
+    result = x.name.s & " " & " id " & $x.id
+
 proc freshGenSyms(n: PNode, owner, orig: PSym, symMap: var TIdTable) =
   # we need to create a fresh set of gensym'ed symbols:
-  if n.kind == nkSym and sfGenSym in n.sym.flags and
-      (n.sym.owner == orig or n.sym.owner.kind == skPackage):
+  #if n.kind == nkSym and sfGenSym in n.sym.flags:
+  #  if n.sym.owner != orig:
+  #    echo "symbol ", n.sym.name.s, " orig ", orig, " owner ", n.sym.owner
+  if n.kind == nkSym and {sfGenSym, sfFromGeneric} * n.sym.flags == {sfGenSym}: # and
+    #  (n.sym.owner == orig or n.sym.owner.kind in {skPackage}):
     let s = n.sym
     var x = PSym(idTableGet(symMap, s))
     if x == nil:

compiler/semtempl.nim

@@ -112,6 +112,7 @@ type
     toBind, toMixin, toInject: IntSet
     owner: PSym
     cursorInBody: bool # only for nimsuggest
+    scopeN: int
     bracketExpr: PNode
 
 template withBracketExpr(ctx, x, body: untyped) =
@@ -141,8 +142,13 @@ proc isTemplParam(c: TemplCtx, n: PNode): bool {.inline.} =
 
 proc semTemplBody(c: var TemplCtx, n: PNode): PNode
 
-proc openScope(c: var TemplCtx) = openScope(c.c)
-proc closeScope(c: var TemplCtx) = closeScope(c.c)
+proc openScope(c: var TemplCtx) =
+  openScope(c.c)
+  inc c.scopeN
+
+proc closeScope(c: var TemplCtx) =
+  dec c.scopeN
+  closeScope(c.c)
 
 proc semTemplBodyScope(c: var TemplCtx, n: PNode): PNode =
   openScope(c)
@@ -166,6 +172,7 @@ proc newGenSym(kind: TSymKind, n: PNode, c: var TemplCtx): PSym =
   result = newSym(kind, considerQuotedIdent(n), c.owner, n.info)
   incl(result.flags, sfGenSym)
   incl(result.flags, sfShadowed)
+  if c.scopeN == 0: incl(result.flags, sfFromGeneric)
 
 proc addLocalDecl(c: var TemplCtx, n: var PNode, k: TSymKind) =
   # locals default to 'gensym':