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http://dev.sourcefabric.org/browse/LS-551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Baelde updated LS-551:
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Priority: Major (was: Blocker)
> Type inference doesn't perform enough subtyping
> -----------------------------------------------
>
> Key: LS-551
> URL: http://dev.sourcefabric.org/browse/LS-551
> Project: Liquidsoap
> Issue Type: Bug
> Components: Liquidsoap
> Affects Versions: 1.0 beta
> Reporter: Romain Beauxis
> Assignee: David Baelde
> Priority: Major
>
> The following does not work:
> output.dummy(
> fallback([strip_blank(sine()), sine()]),
> fallible=true)
> I get:
> this value has type
> source(_)
> but it should be a subtype of (the type of the value at line 1, char 35-42)
> active_source(_)
> It is my understanding that there should be no technical reasons to prohibit
> this and so there must be something to do at the type-checking level..
> Edit: The problem is that type inference guesses that this is a list of
> active_sources, but the second one isn't active; we need a constraint-based
> type inference algorithm to integrate subtyping in smarter ways, eg. delay
> the guess until we've seen all elements.
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