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Deprecation checks in RefChecks were looking into all TypeTrees
to find references to deprecated type aliases. However, when the
compiler infers a type argument or type of a member it creates
a TypeTree (with a null original) that was also leading to warnings.
I ran into this problem often when upgrading a build from SBT 0.12
to 0.13: a plugin I was using used the deprecated type alias, and I
suffered transitively when I used methods from its API.
This commit disables the checks for inferred TypeTree-s.
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