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This reverts commit eca045bc.

Revert "Add fingerprint of Generic representation when serializing."

This reverts commit ebcae71d.

cabal-version semantics prior to 1.8 joined all `build-depends`;
as suggested by @ezyang it's easier for now to just fallback to
legacy mode, than to add proper support for per-components builds
for ancient cabal-spec versions

Fixes #4121

adding ghc-prof-options to fprof warning

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

GHC will make use of this to do more accurate shadowing computation,
because now we can tell if something is ABI-compatible, even if the 'id'
matches.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

This is similar to what we do in Distribution.Simple.Build;
preparatory commit so we can read out the ABI hashes of
our dependencies from installedPkgs.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

fixes #3718

Bump directory upper bound

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

This is probably too much info for big instantiations, but it's
better than nothing.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

[ci skip]

First create then rename symlinks to fix #4156

[ci skip]

Update 'bootstrap.sh'.

Revert "Solver: Add missing call to 'simplifyVar'."

[ci skip]

(cherry picked from commit e0bf43c3)

Nix integration

This reverts commit adc1fe96.

Migrate ConflictSet qpn ↦ ConflictSet

Print final conflict set when search is exhaustive

Before this change, the behavior in the exhaustive case was to filter
the log up until the first error with the final conflict set, leading to
possibly inconsistently filtered error messages.

Now we always use the conflict set from the first error to filter the
the log, and then display the final conflict set as an additional hint.

[ci skip]

[ci skip]

Solver: Fix space leak in 'addlinking' (issue #2899).