#10613: Mechanism for checking that we only enter single-entry thunks once -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by rwbarton): For what it's worth, while investigating #10414, I ran the whole test suite with `-feager-blackholing`, which (at the time) caused all single- entry thunks to be overwritten with a black hole on entry. There were no test failures, which gives me a reasonably high degree of confidence that the "single-entry thunks are entered only once" invariant is maintained, outside of the situations involving multiple threads entering a closure simultaneously discussed in #10414. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10613#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler