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-rw-r--r--compiler/semcall.nim2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/semcall.nim b/compiler/semcall.nim
index c391cb7c9..5e3e8b65b 100644
--- a/compiler/semcall.nim
+++ b/compiler/semcall.nim
@@ -569,6 +569,8 @@ proc explicitGenericInstantiation(c: PContext, n: PNode, s: PSym): PNode =
   assert n.kind == nkBracketExpr
   for i in 1..sonsLen(n)-1:
     let e = semExpr(c, n.sons[i])
+    if e.typ == nil:
+      localError(c.config, e.info, "expression has no type")
     n.sons[i].typ = e.typ.skipTypes({tyTypeDesc})
   var s = s
   var a = n.sons[0]