Huon Wilson 63a50936e4 [AST] Keep generic type params generic in RequirementEnvironments. ...

Before this patch, the use of GenericSignature::getSubstitutionMap to
create a substitution map would result in some generic parameters being
completely elided (well, being mapped to concrete types causing a
->castTo<GenericTypeParamType>() to crash). This patch changes that to
just do the reindexing of the type parameters directly, without trying
to be smart with more contextual information (i.e. τ_0_0 -> τ_1_0, even
if there's a τ_0_0 == Int requirement).

Fixes rdar://problem/37291254 and SR-6990.

2018-02-13 22:58:14 +11:00

9.1 KiB

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