Compute mutability of closure captures #37
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When `capture_disjoint_fields` is not enabled, checking if the root variable binding is mutable would suffice. However with the feature enabled, the captured place might be mutable because it dereferences a mutable reference. This PR computes the mutability of each capture after capture analysis in rustc_typeck. We store this in `ty::CapturedPlace` and then use `ty::CapturedPlace::mutability` in mir_build and borrow_check.
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When
capture_disjoint_fieldsis not enabled, checking if the root variablebinding is mutable would suffice.
However, with the feature enabled, the captured place might be mutable
because it dereferences a mutable reference.
This PR computes the mutability of each capture after capture analysis
in rustc_typeck. We store this in
ty::CapturedPlaceand then usety::CapturedPlace::mutabilityin mir_build and borrow_check.This change is