Fix #8759 by not panicking with TH and patsyns.

We should still have pattern synonyms in TH, though.

5 files changed, 25 insertions, 0 deletions

diff --git a/testsuite/tests/th/T8759.hs b/testsuite/tests/th/T8759.hs
new file mode 100644
index 0000000000..298761a5a4
--- /dev/null
+++ b/testsuite/tests/th/T8759.hs
@@ -0,0 +1,11 @@
+{-# LANGUAGE TemplateHaskell, PatternSynonyms #-}
+
+module T8759 where
+
+import Language.Haskell.TH
+
+pattern P = ()
+
+$( do info <- reify 'P
+      reportWarning (show info)
+      return [] )
diff --git a/testsuite/tests/th/T8759.stderr b/testsuite/tests/th/T8759.stderr
new file mode 100644
index 0000000000..3b5474b1ae
--- /dev/null
+++ b/testsuite/tests/th/T8759.stderr
@@ -0,0 +1,3 @@
+
+T8759.hs:9:4:
+    Can't represent pattern synonyms in Template Haskell: P
diff --git a/testsuite/tests/th/T8759a.hs b/testsuite/tests/th/T8759a.hs
new file mode 100644
index 0000000000..3d8089c2fa
--- /dev/null
+++ b/testsuite/tests/th/T8759a.hs
@@ -0,0 +1,5 @@
+{-# LANGUAGE TemplateHaskell, PatternSynonyms #-}
+
+module T8759a where
+
+foo = [d| pattern Q = False |]
diff --git a/testsuite/tests/th/T8759a.stderr b/testsuite/tests/th/T8759a.stderr
new file mode 100644
index 0000000000..ff0fd495df
--- /dev/null
+++ b/testsuite/tests/th/T8759a.stderr
@@ -0,0 +1,4 @@
+
+T8759a.hs:5:7:
+    pattern synonyms not (yet) handled by Template Haskell
+      pattern Q = False
diff --git a/testsuite/tests/th/all.T b/testsuite/tests/th/all.T
index 5b064ba2ea..3e88970f51 100644
--- a/testsuite/tests/th/all.T
+++ b/testsuite/tests/th/all.T
@@ -317,3 +317,5 @@ test('T8577',
      ['T8577', '-v0 ' + config.ghc_th_way_flags])
 test('T8633', normal, compile_and_run, [''])
 test('T8625', normal, ghci_script, ['T8625.script'])
+test('T8759', normal, compile_fail, ['-v0'])
+test('T8759a', normal, compile_fail, ['-v0'])
\ No newline at end of file