Doug Gregor 9554e61705 [AST] Fix a crash when conformance lookup fails during substitution. ...

The enclosing conformance-lookup operation can fail (i.e., it returns
Optional), but the nested call was force-unwrapping the optional from
an inner call for no particular reason. Stop doing that, which fixes
SR-6466.

Note that the offending code is still something that should go away in
time, so this is merely polishing the band-aid to avoid a crash that
occurs often with conditional conformances.

2017-11-24 23:18:11 -08:00

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