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-rw-r--r--compiler/isolation_check.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/isolation_check.nim b/compiler/isolation_check.nim
index 68a212794..2674605dc 100644
--- a/compiler/isolation_check.nim
+++ b/compiler/isolation_check.nim
@@ -13,6 +13,9 @@
 import
   ast, types, renderer, intsets
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 proc canAlias(arg, ret: PType; marker: var IntSet): bool
 
 proc canAliasN(arg: PType; n: PNode; marker: var IntSet): bool =