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rust: error for WdirUnsupported with cpython conversion as exception

Authored by gracinet.

Description

rust: error for WdirUnsupported with cpython conversion as exception

This introduces WorkingDirectoryUnsupported as an enum variant
of GraphError in the core and converts it to the expected
mercurial.error.WdirUnsupported.

Details

Committed
gracinetJan 23 2019, 7:47 AM
Parents
rHG2f54f31c41aa: rust: working directory revision number constant
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