[Beam] Fix Erlang.receive<'T>() resolving to timeout overload#4395
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F# passes a unit argument for parameterless receive<'T>(), which matched the timeout overload pattern `[ timeoutArg ]` instead of `[]`, generating an invalid `after ok -> undefined` clause that crashes BEAM at runtime. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Erlang.receive<'T>()(blocking, no timeout) incorrectly generatingafter ok -> undefinedin Erlang output, which crashes BEAM with{timeout_value, ...}[ timeoutArg ]pattern instead of[]in Beam ReplacementsUnitConstantargs before the timeout branchTest plan
test Erlang receive blocking waits for delayed messagethat spawns a delayed sender — fails without fix (BEAM crashes onafter ok), passes with fix🤖 Generated with Claude Code