[PATCH 1 of 2] dispatch: move part of callcatch to scmutil

Jun Wu quark at fb.com
Thu Nov 24 08:39:25 EST 2016

Excerpts from Yuya Nishihara's message of 2016-11-24 22:28:28 +0900:
> This seems better belonging to the high-level callcatch(), but anyway it looks
> like a moot. If C extensions aren't compiled at all, ImportError would be
> raised earlier.

demandimport could be a source of (surprising) ImportErrors with 3rd-party
code. Like hgsubversion imports svn binding, while the binding does not

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