fixes #18565 (#18593)

* fixes #18565

compiler/semstmts.nim

@@ -2260,20 +2260,20 @@ proc semStmtList(c: PContext, n: PNode, flags: TExprFlags): PNode =
   #                                         nkNilLit, nkEmpty}:
   #  dec last
   for i in 0..<n.len:
-    var expr = semExpr(c, n[i], flags)
+    var x = semExpr(c, n[i], flags)
-    n[i] = expr
+    n[i] = x
-    if c.matchedConcept != nil and expr.typ != nil and
+    if c.matchedConcept != nil and x.typ != nil and
         (nfFromTemplate notin n.flags or i != last):
-      case expr.typ.kind
+      case x.typ.kind
       of tyBool:
-        if expr.kind == nkInfix and
+        if x.kind == nkInfix and
-            expr[0].kind == nkSym and
+            x[0].kind == nkSym and
-            expr[0].sym.name.s == "==":
+            x[0].sym.name.s == "==":
-          if expr[1].typ.isUnresolvedStatic:
+          if x[1].typ.isUnresolvedStatic:
-            inferConceptStaticParam(c, expr[1], expr[2])
+            inferConceptStaticParam(c, x[1], x[2])
             continue
-          elif expr[2].typ.isUnresolvedStatic:
+          elif x[2].typ.isUnresolvedStatic:
-            inferConceptStaticParam(c, expr[2], expr[1])
+            inferConceptStaticParam(c, x[2], x[1])
             continue
 
         let verdict = semConstExpr(c, n[i])

compiler/sigmatch.nim

@@ -2272,6 +2272,8 @@ proc prepareOperand(c: PContext; formal: PType; a: PNode): PNode =
   else:
     result = a
     considerGenSyms(c, result)
+    if result.kind != nkHiddenDeref and result.typ.kind in {tyVar, tyLent} and c.matchedConcept == nil:
+      result = newDeref(result)
 
 proc prepareOperand(c: PContext; a: PNode): PNode =
   if a.typ.isNil:

tests/arc/tkeys_lent.nim

@@ -0,0 +1,17 @@
+discard """
+  output: '''{"string": 2}'''
+  cmd: "nim c --gc:orc $file"
+"""
+
+import tables
+
+proc use(x: int) = echo x
+
+proc main =
+  var tab = {"string": 1}.toTable
+  for keyAAA in tab.keys():
+    template alias(): untyped = tab[keyAAA]
+    alias() = 2
+  echo tab
+
+main()

tests/stdlib/tgetfileinfo.nim

@@ -1,5 +1,6 @@
 discard """
   output: "pcDir\npcFile\npcLinkToDir\npcLinkToFile\n"
+  joinable: false
 """
 
 import os, strutils

tests/stdlib/tos.nim

@@ -22,6 +22,7 @@ __really_obscure_dir_name/test
 Raises
 Raises
 '''
+  joinable: false
 """
 # test os path creation, iteration, and deletion