Elton Leander Pinto authored 3 years ago and Marge Bot committed 3 years ago

This patch ensures that the pretty printer formats LambdaCase and where
clauses using braces (instead of layout) to remain consistent with the
formatting of other statements (like `do` and `case`)

Summary:
This commit adds stage 1 support for Template Haskell
quoting, e.g. [| ... expr ... |], which is useful
for authors of quasiquoter libraries that do not actually
need splices.  The TemplateHaskell extension now does not
unconditionally fail; it only fails if the renamer encounters
a splice that it can't run.

In order to make sure the referenced data structures
are consistent, template-haskell is now a boot library.
There are some minor BC changes to template-haskell to make it boot
on GHC 7.8.

Note for reviewer: big diff changes are simply code
being moved out of an ifdef; there was no other substantive
change to that code.

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

Test Plan: validate

Reviewers: simonpj, austin, goldfire

Subscribers: bgamari, thomie

Differential Revision: https://phabricator.haskell.org/D876

GHC Trac Issues: #10382

Revert "Quick fix: drop base bound on template-haskell."

This reverts commit 3c70ae03.

Revert "Always do polymorphic typed quote check, c.f. #10384"

This reverts commit 9a43b2c1.

Revert "RnSplice's staging test should be applied for quotes in stage1."

This reverts commit eb0ed403.

Revert "Split off quotes/ from th/ for tests that can be done on stage1 compiler."

This reverts commit 21c72e7d.

Revert "Support stage 1 Template Haskell (non-quasi) quotes, fixes #10382."

This reverts commit 28257cae.

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

Test Plan: run these tests with stage1

Reviewers: simonpj, austin

Subscribers: bgamari, thomie

Differential Revision: https://phabricator.haskell.org/D877

GHC Trac Issues: #10382

When printing TH code we see the (nicely numbered)
uniques on fresh names. A consequence of the fix
to #5379

The name +_0 is a bit dubious.