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-rw-r--r--lib/compiler/src/sys_core_fold.erl8
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/compiler/src/sys_core_fold.erl b/lib/compiler/src/sys_core_fold.erl
index feb34b364f..44a6aa425d 100644
--- a/lib/compiler/src/sys_core_fold.erl
+++ b/lib/compiler/src/sys_core_fold.erl
@@ -1142,7 +1142,13 @@ clause_1(#c_clause{guard=G0,body=B0}=Cl, Ps1, Cexpr, Ctxt, Sub1) ->
%%
%% case A of NewVar when true -> ...
%%
- sub_set_var(Var, Cexpr, Sub2);
+ case cerl:is_c_fname(Cexpr) of
+ false ->
+ sub_set_var(Var, Cexpr, Sub2);
+ true ->
+ %% We must not copy funs, and especially not into guards.
+ Sub2
+ end;
_ ->
Sub2
end,