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Diffstat (limited to 'libraries/base/GHC/Stack.hs')
| -rw-r--r-- | libraries/base/GHC/Stack.hs | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libraries/base/GHC/Stack.hs b/libraries/base/GHC/Stack.hs index f5b175c0bb..1f102c9f9b 100644 --- a/libraries/base/GHC/Stack.hs +++ b/libraries/base/GHC/Stack.hs @@ -85,7 +85,10 @@ popCallStack stk = case stk of -- -- @since 4.9.0.0 callStack :: HasCallStack => CallStack -callStack = popCallStack ?callStack +callStack = + case ?callStack of + EmptyCallStack -> EmptyCallStack + _ -> popCallStack ?callStack {-# INLINE callStack #-} -- | Perform some computation without adding new entries to the 'CallStack'. |