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https://issues.apache.org/jira/browse/THRIFT-1532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223506#comment-13223506
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Björn Bylander commented on THRIFT-1532:
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Huh, you're right. Based on that documentation it would seem that the problem
is that undefined is used as a default value. I'll add an example soon.
> The type specifications in the generated Erlang code should include
> "undefined" where it's used as a default value
> ------------------------------------------------------------------------------------------------------------------
>
> Key: THRIFT-1532
> URL: https://issues.apache.org/jira/browse/THRIFT-1532
> Project: Thrift
> Issue Type: Improvement
> Components: Erlang - Compiler
> Affects Versions: 0.8
> Environment: Erlang/OTP R15B.
> Reporter: Björn Bylander
> Assignee: Anthony Molinaro
> Priority: Minor
> Labels: compiler, dialyzer, erlang, specification, type
> Attachments: THRIFT-1532_type_allows_undefined.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> The Erlang code generated by the compiler for, for example, an integer field
> of a struct sets a default value of 'undefined' but the type to just
> 'integer()' which doesn't include the default value. This makes Dialyzer
> complain if the field has not been initialized as it gets set to 'undefined'
> instead of an integer value.
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