[beta] backports#75261

Merged

bors merged 15 commits intorust-lang:betafrom

Mark-Simulacrum:beta-next

Aug 7, 2020

Commits on Aug 7, 2020

Forbid non-derefable types explicitly in unsizing casts

JohnTitor
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forbid `#[track_caller]` on main

lcnr
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tweak error message

lcnr
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Fix #[track_caller] shims for trait objects.

anp
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rustc_target: Add a target spec option for disabling `--eh-frame-hdr`

petrochenkov
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ci: allow RLA to pick the right PR number

emilyalbini
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ci: upload non-macOS from GHA instead of Azure Pipelines

emilyalbini
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ci: disable Azure Pipelines except for macOS

emilyalbini
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Add the aarch64-apple-darwin target

shepmaster
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Use `ReEmpty(U0)` as the implicit region bound in typeck

matthewjasper
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rustbuild: drop tool::should_install

Keruspe
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lint: use `transparent_newtype_field` to avoid ICE

davidtwco
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Don't panic if the lhs of a div by zero is not statically known

oli-obk
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improper_ctypes_definitions: allow `Box`

davidtwco
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typeck: check for infer before type impls trait

davidtwco
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Mark-Simulacrum
committed