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-rw-r--r--testsuite/tests/overloadedrecflds/ghci/GHCiDRF.hs4
-rw-r--r--testsuite/tests/overloadedrecflds/ghci/GHCiDRF.script11
-rw-r--r--testsuite/tests/overloadedrecflds/ghci/GHCiDRF.stdout48
-rw-r--r--testsuite/tests/overloadedrecflds/ghci/all.T1
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/NFSDRF.hs36
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/NFSExport.hs8
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/NFSImport.hs5
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/NoFieldSelectors.hs30
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/T18999_FieldSelectors.hs7
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/T18999_NoFieldSelectors.hs9
-rw-r--r--testsuite/tests/overloadedrecflds/should_compile/all.T5
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.hs10
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.stderr4
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFS9156.hs4
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFS9156.stderr5
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.hs10
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.stderr5
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSExport.hs3
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSExport.stderr5
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSMixed.hs5
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSMixed.stderr13
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSMixedA.hs8
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.hs9
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.stderr6
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.hs16
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.stderr40
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFailA.hs11
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.hs8
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.stderr18
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/all.T8
-rw-r--r--testsuite/tests/overloadedrecflds/should_fail/overloadedrecfldsfail14.stderr2
31 files changed, 353 insertions, 1 deletions
diff --git a/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.hs b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.hs
new file mode 100644
index 0000000000..5b54ad5ba3
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.hs
@@ -0,0 +1,4 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+module GHCiDRF where
+data T = MkT { foo :: Int, bar :: Int }
+data U = MkU { bar :: Bool }
diff --git a/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.script b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.script
new file mode 100644
index 0000000000..89a7623c8b
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.script
@@ -0,0 +1,11 @@
+:l GHCiDRF
+:t GHCiDRF.foo
+:t GHCiDRF.bar
+:info GHCiDRF.foo
+:info GHCiDRF.bar
+:m - GHCiDRF
+:t GHCiDRF.foo
+:t GHCiDRF.bar
+:info GHCiDRF.foo
+:info GHCiDRF.bar
+GHCiDRF.bar (GHCiDRF.MkU True :: GHCiDRF.U)
diff --git a/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.stdout b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.stdout
new file mode 100644
index 0000000000..1a7b44e64e
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/ghci/GHCiDRF.stdout
@@ -0,0 +1,48 @@
+GHCiDRF.foo :: T -> Int
+
+<interactive>:1:1: error:
+ Ambiguous occurrence ‘GHCiDRF.bar’
+ It could refer to
+ either the field ‘bar’, defined at GHCiDRF.hs:4:16
+ or the field ‘bar’, defined at GHCiDRF.hs:3:28
+type T :: *
+data T = MkT {foo :: Int, ...}
+ -- Defined at GHCiDRF.hs:3:16
+type U :: *
+data U = MkU {GHCiDRF.bar :: Bool}
+ -- Defined at GHCiDRF.hs:4:16
+
+type T :: *
+data T = MkT {..., GHCiDRF.bar :: Int}
+ -- Defined at GHCiDRF.hs:3:28
+GHCiDRF.foo :: GHCiDRF.T -> Int
+
+<interactive>:1:1: error:
+ Ambiguous occurrence ‘GHCiDRF.bar’
+ It could refer to
+ either the field ‘bar’,
+ imported qualified from ‘GHCiDRF’
+ (and originally defined at GHCiDRF.hs:3:28-30)
+ or the field ‘bar’,
+ imported qualified from ‘GHCiDRF’
+ (and originally defined at GHCiDRF.hs:4:16-18)
+type GHCiDRF.T :: *
+data GHCiDRF.T = GHCiDRF.MkT {GHCiDRF.foo :: Int, ...}
+ -- Defined at GHCiDRF.hs:3:16
+type GHCiDRF.T :: *
+data GHCiDRF.T = GHCiDRF.MkT {..., GHCiDRF.bar :: Int}
+ -- Defined at GHCiDRF.hs:3:28
+
+type GHCiDRF.U :: *
+data GHCiDRF.U = GHCiDRF.MkU {GHCiDRF.bar :: Bool}
+ -- Defined at GHCiDRF.hs:4:16
+
+<interactive>:11:1: error:
+ Ambiguous occurrence ‘GHCiDRF.bar’
+ It could refer to
+ either the field ‘bar’,
+ imported qualified from ‘GHCiDRF’
+ (and originally defined at GHCiDRF.hs:3:28-30)
+ or the field ‘bar’,
+ imported qualified from ‘GHCiDRF’
+ (and originally defined at GHCiDRF.hs:4:16-18)
diff --git a/testsuite/tests/overloadedrecflds/ghci/all.T b/testsuite/tests/overloadedrecflds/ghci/all.T
index e8c008d1df..7bddafd6fb 100644
--- a/testsuite/tests/overloadedrecflds/ghci/all.T
+++ b/testsuite/tests/overloadedrecflds/ghci/all.T
@@ -1,3 +1,4 @@
test('duplicaterecfldsghci01', combined_output, ghci_script, ['duplicaterecfldsghci01.script'])
test('overloadedlabelsghci01', combined_output, ghci_script, ['overloadedlabelsghci01.script'])
test('T13438', [expect_broken(13438), combined_output], ghci_script, ['T13438.script'])
+test('GHCiDRF', [extra_files(['GHCiDRF.hs']), combined_output], ghci_script, ['GHCiDRF.script'])
diff --git a/testsuite/tests/overloadedrecflds/should_compile/NFSDRF.hs b/testsuite/tests/overloadedrecflds/should_compile/NFSDRF.hs
new file mode 100644
index 0000000000..a1e8744974
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/NFSDRF.hs
@@ -0,0 +1,36 @@
+{-# LANGUAGE NoFieldSelectors #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+
+module NFSDRF where
+
+import Prelude
+
+
+data Foo = Foo { foo :: Int, bar :: String }
+data Bar = Bar { foo :: Int, bar' :: String }
+
+foo = 3 -- should not conflict
+
+fooX = foo + 1
+
+rwcPatFoo Foo{..} = show (foo, bar)
+rwcConFoo = Foo{..} where
+ foo = 42
+ bar = "hello"
+
+foo1 :: Foo
+foo1 = Foo 3 "bar"
+
+foo2 = Foo { foo = 3, bar = "bar" } -- disambiguate foo
+
+
+-- foo3 :: Foo
+-- foo3 = foo1 { foo = 4 } -- currently rejected, see #18999
+
+foo4 = foo1 { bar = "baz" } -- unambiguous
+
+bar0 = Bar { foo = 0, bar' = "bar'" }
+
+-- bar1 :: Bar
+-- bar1 = bar0 { foo = 1 } -- currently rejected, see #18999
diff --git a/testsuite/tests/overloadedrecflds/should_compile/NFSExport.hs b/testsuite/tests/overloadedrecflds/should_compile/NFSExport.hs
new file mode 100644
index 0000000000..8e83c085bf
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/NFSExport.hs
@@ -0,0 +1,8 @@
+{-# LANGUAGE NoFieldSelectors #-}
+
+module NFSExport (T(foo), def) where
+
+data T = MkT { foo :: Bool }
+
+def :: T
+def = MkT False
diff --git a/testsuite/tests/overloadedrecflds/should_compile/NFSImport.hs b/testsuite/tests/overloadedrecflds/should_compile/NFSImport.hs
new file mode 100644
index 0000000000..433e9f06fc
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/NFSImport.hs
@@ -0,0 +1,5 @@
+module NFSImport where
+
+import NFSExport
+
+t = def { foo = True }
diff --git a/testsuite/tests/overloadedrecflds/should_compile/NoFieldSelectors.hs b/testsuite/tests/overloadedrecflds/should_compile/NoFieldSelectors.hs
new file mode 100644
index 0000000000..d114861672
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/NoFieldSelectors.hs
@@ -0,0 +1,30 @@
+{-# LANGUAGE NoFieldSelectors #-}
+{-# LANGUAGE RecordWildCards #-}
+
+
+module NoFieldSelectors
+where
+
+import Prelude
+
+
+data Foo = Foo { foo :: Int, bar :: String }
+
+{-# ANN foo () #-}
+foo = 3 -- should not conflict
+
+fooX = foo + 1
+
+rwcPatFoo Foo{..} = show (foo, bar)
+rwcConFoo = Foo{..} where
+ foo = 42
+ bar = "hello"
+
+foo1 :: Foo
+foo1 = Foo 3 "bar"
+
+foo2 = Foo { foo = 3, bar = "bar" } -- disambiguate foo
+
+-- foo3 = foo1 { foo = 4 } -- currently rejected, see #18999
+
+foo4 = foo1 { bar = "baz" } -- bar is unambiguous
diff --git a/testsuite/tests/overloadedrecflds/should_compile/T18999_FieldSelectors.hs b/testsuite/tests/overloadedrecflds/should_compile/T18999_FieldSelectors.hs
new file mode 100644
index 0000000000..8fb6e5f9df
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/T18999_FieldSelectors.hs
@@ -0,0 +1,7 @@
+{-# LANGUAGE DisambiguateRecordFields #-}
+module T18999_FieldSelectors where
+
+data Foo = Foo { not :: Int }
+
+foo = Foo { not = 1 }
+y = foo { not = 2 }
diff --git a/testsuite/tests/overloadedrecflds/should_compile/T18999_NoFieldSelectors.hs b/testsuite/tests/overloadedrecflds/should_compile/T18999_NoFieldSelectors.hs
new file mode 100644
index 0000000000..69bf8fb427
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_compile/T18999_NoFieldSelectors.hs
@@ -0,0 +1,9 @@
+{-# LANGUAGE DisambiguateRecordFields #-}
+{-# LANGUAGE NoFieldSelectors #-}
+module T18999_NoFieldSelectors where
+
+data Foo = Foo { bar :: Int, baz :: Int }
+baz = 42
+
+foo = Foo { bar = 23, baz = 1 }
+y = foo { baz = baz }
diff --git a/testsuite/tests/overloadedrecflds/should_compile/all.T b/testsuite/tests/overloadedrecflds/should_compile/all.T
index 515b19635f..a043570034 100644
--- a/testsuite/tests/overloadedrecflds/should_compile/all.T
+++ b/testsuite/tests/overloadedrecflds/should_compile/all.T
@@ -3,3 +3,8 @@ test('T12609', normal, compile, [''])
test('T16597', [], multimod_compile, ['T16597', '-v0'])
test('T17176', normal, compile, [''])
test('DRFPatSynExport', [], makefile_test, ['DRFPatSynExport'])
+test('NoFieldSelectors', normal, compile, [''])
+test('NFSDRF', normal, compile, [''])
+test('NFSImport', [extra_files(['NFSExport.hs'])], multimod_compile, ['NFSImport NFSExport', '-v0'])
+test('T18999_NoFieldSelectors', normal, compile, [''])
+test('T18999_FieldSelectors', normal, compile, [''])
diff --git a/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.hs b/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.hs
new file mode 100644
index 0000000000..e33f4c0971
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.hs
@@ -0,0 +1,10 @@
+{-# LANGUAGE FieldSelectors #-}
+
+module FieldSelectors
+where
+
+import Prelude
+
+data Foo = Foo { foo :: Int, bar :: String }
+
+foo = 3
diff --git a/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.stderr b/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.stderr
new file mode 100644
index 0000000000..8edc117f3d
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/FieldSelectors.stderr
@@ -0,0 +1,4 @@
+FieldSelectors.hs:10:1:
+ Multiple declarations of ‘foo’
+ Declared at: FieldSelectors.hs:8:18
+ FieldSelectors.hs:10:1 \ No newline at end of file
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFS9156.hs b/testsuite/tests/overloadedrecflds/should_fail/NFS9156.hs
new file mode 100644
index 0000000000..4cc1091cf2
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFS9156.hs
@@ -0,0 +1,4 @@
+{-# LANGUAGE NoFieldSelectors #-}
+module NFS9156 where
+data D = D1 { f1 :: Int }
+ | D2 { f1, f1 :: Int }
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFS9156.stderr b/testsuite/tests/overloadedrecflds/should_fail/NFS9156.stderr
new file mode 100644
index 0000000000..66ab58fcbd
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFS9156.stderr
@@ -0,0 +1,5 @@
+
+NFS9156.hs:4:19: error:
+ Multiple declarations of ‘f1’
+ Declared at: NFS9156.hs:3:15
+ NFS9156.hs:4:19
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.hs b/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.hs
new file mode 100644
index 0000000000..5da0175a1e
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.hs
@@ -0,0 +1,10 @@
+{-# LANGUAGE NoFieldSelectors #-}
+{-# LANGUAGE NoDuplicateRecordFields #-}
+module NFSDuplicate where
+
+-- Two definitions of 'foo' as fields is an error, even though it is permitted
+-- to define it as a non-field.
+data S = MkS { foo :: Int }
+data T = MkT { foo :: Int }
+
+foo = ()
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.stderr b/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.stderr
new file mode 100644
index 0000000000..f30bb1e490
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSDuplicate.stderr
@@ -0,0 +1,5 @@
+
+NFSDuplicate.hs:8:16: error:
+ Multiple declarations of ‘foo’
+ Declared at: NFSDuplicate.hs:7:16
+ NFSDuplicate.hs:8:16
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSExport.hs b/testsuite/tests/overloadedrecflds/should_fail/NFSExport.hs
new file mode 100644
index 0000000000..839b32bae4
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSExport.hs
@@ -0,0 +1,3 @@
+{-# LANGUAGE NoFieldSelectors #-}
+module NFSExport (T(foo), foo) where -- only T(foo) is supported
+data T = MkT { foo :: Bool }
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSExport.stderr b/testsuite/tests/overloadedrecflds/should_fail/NFSExport.stderr
new file mode 100644
index 0000000000..c704facfc9
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSExport.stderr
@@ -0,0 +1,5 @@
+
+NFSExport.hs:2:27: error:
+ Not in scope: ‘foo’
+ NB: ‘foo’ is a field selector belonging to the type ‘T’
+ that has been suppressed by NoFieldSelectors
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.hs b/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.hs
new file mode 100644
index 0000000000..d2b3d8dd1b
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.hs
@@ -0,0 +1,5 @@
+module NFSMixed where
+
+import NFSMixedA
+
+test = \x -> x { foo = 0 }
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.stderr b/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.stderr
new file mode 100644
index 0000000000..b569125c4a
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSMixed.stderr
@@ -0,0 +1,13 @@
+
+NFSMixed.hs:5:18: error:
+ Ambiguous occurrence ‘foo’
+ It could refer to
+ either the field ‘foo’,
+ imported from ‘NFSMixedA’ at NFSMixed.hs:3:1-16
+ (and originally defined at NFSMixedA.hs:4:18-20)
+ or the field ‘foo’,
+ imported from ‘NFSMixedA’ at NFSMixed.hs:3:1-16
+ (and originally defined at NFSMixedA.hs:5:18-20)
+ or ‘NFSMixedA.foo’,
+ imported from ‘NFSMixedA’ at NFSMixed.hs:3:1-16
+ (and originally defined at NFSMixedA.hs:8:1-3)
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSMixedA.hs b/testsuite/tests/overloadedrecflds/should_fail/NFSMixedA.hs
new file mode 100644
index 0000000000..626d5bfc35
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSMixedA.hs
@@ -0,0 +1,8 @@
+{-# LANGUAGE NoFieldSelectors #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+module NFSMixedA where
+data Foo = Foo { foo :: Int, bar :: String }
+data Bar = Bar { foo :: Int, bar' :: String }
+
+foo :: Int
+foo = 0
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.hs b/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.hs
new file mode 100644
index 0000000000..0eb415d032
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.hs
@@ -0,0 +1,9 @@
+{-# LANGUAGE NoFieldSelectors #-}
+
+module NFSSuppressed where
+
+import Prelude
+
+data Foo = Foo { foo :: Int }
+
+x = foo
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.stderr b/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.stderr
new file mode 100644
index 0000000000..51415300e0
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NFSSuppressed.stderr
@@ -0,0 +1,6 @@
+
+NFSSuppressed.hs:9:5: error:
+ • Variable not in scope: foo
+ • Perhaps you meant data constructor ‘Foo’ (line 7)
+ NB: ‘foo’ is a field selector belonging to the type ‘Foo’
+ that has been suppressed by NoFieldSelectors
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.hs b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.hs
new file mode 100644
index 0000000000..c2ade91335
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE NoFieldSelectors #-}
+module NoFieldSelectorsFail (foo, bar) where
+
+import NoFieldSelectorsFailA
+
+foo1 :: Foo
+foo1 = Foo 3 "bar"
+
+bar0 = Bar { foo = 0, bar' = "bar'" }
+
+foo3 :: Foo
+foo3 = foo1 { foo = 4 } -- update
+
+bar1 = bar0 { foo = 1 }
+
+foo4 = foo1 { bar = "" } -- currently rejected, see #18999
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.stderr b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.stderr
new file mode 100644
index 0000000000..13193f38d9
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFail.stderr
@@ -0,0 +1,40 @@
+
+NoFieldSelectorsFail.hs:9:14: error:
+ Ambiguous occurrence ‘foo’
+ It could refer to
+ either the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:5:18-20)
+ or the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:6:18-20)
+
+NoFieldSelectorsFail.hs:12:15: error:
+ Ambiguous occurrence ‘foo’
+ It could refer to
+ either the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:5:18-20)
+ or the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:6:18-20)
+
+NoFieldSelectorsFail.hs:14:15: error:
+ Ambiguous occurrence ‘foo’
+ It could refer to
+ either the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:5:18-20)
+ or the field ‘foo’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:6:18-20)
+
+NoFieldSelectorsFail.hs:16:15: error:
+ Ambiguous occurrence ‘bar’
+ It could refer to
+ either the field ‘bar’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:5:30-32)
+ or ‘NoFieldSelectorsFailA.bar’,
+ imported from ‘NoFieldSelectorsFailA’ at NoFieldSelectorsFail.hs:4:1-28
+ (and originally defined at NoFieldSelectorsFailA.hs:8:1-3)
diff --git a/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFailA.hs b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFailA.hs
new file mode 100644
index 0000000000..1c542a869a
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/NoFieldSelectorsFailA.hs
@@ -0,0 +1,11 @@
+{-# LANGUAGE NoFieldSelectors #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+module NoFieldSelectorsFailA where
+
+data Foo = Foo { foo :: Int, bar :: String }
+data Bar = Bar { foo :: Int, bar' :: String }
+
+bar = undefined
+
+foo4 = (Foo 3 "bar") { bar = "" } -- permitted thanks to DisambiguateRecordFields
+ -- (implied by DuplicateRecordFields), see #18999
diff --git a/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.hs b/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.hs
new file mode 100644
index 0000000000..2a78c20d13
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.hs
@@ -0,0 +1,8 @@
+{-# LANGUAGE NoFieldSelectors #-}
+module T18999_NoDisambiguateRecordFields where
+
+data Foo = Foo { not :: Int }
+
+foo = Foo { not = 1 } -- ambiguous without DisambiguateRecordFields
+x = not -- unambiguous because of NoFieldSelectors
+y = foo { not = 2 } -- ambiguous without DisambiguateRecordFields
diff --git a/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.stderr b/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.stderr
new file mode 100644
index 0000000000..425e8d7245
--- /dev/null
+++ b/testsuite/tests/overloadedrecflds/should_fail/T18999_NoDisambiguateRecordFields.stderr
@@ -0,0 +1,18 @@
+
+T18999_NoDisambiguateRecordFields.hs:6:13: error:
+ Ambiguous occurrence ‘not’
+ It could refer to
+ either ‘Prelude.not’,
+ imported from ‘Prelude’ at T18999_NoDisambiguateRecordFields.hs:2:8-40
+ (and originally defined in ‘GHC.Classes’)
+ or the field ‘not’,
+ defined at T18999_NoDisambiguateRecordFields.hs:4:18
+
+T18999_NoDisambiguateRecordFields.hs:8:11: error:
+ Ambiguous occurrence ‘not’
+ It could refer to
+ either ‘Prelude.not’,
+ imported from ‘Prelude’ at T18999_NoDisambiguateRecordFields.hs:2:8-40
+ (and originally defined in ‘GHC.Classes’)
+ or the field ‘not’,
+ defined at T18999_NoDisambiguateRecordFields.hs:4:18
diff --git a/testsuite/tests/overloadedrecflds/should_fail/all.T b/testsuite/tests/overloadedrecflds/should_fail/all.T
index 09bee3ba06..644d3a8427 100644
--- a/testsuite/tests/overloadedrecflds/should_fail/all.T
+++ b/testsuite/tests/overloadedrecflds/should_fail/all.T
@@ -36,4 +36,12 @@ test('T17965', normal, compile_fail, [''])
test('DRFHoleFits', extra_files(['DRFHoleFits_A.hs']), multimod_compile_fail, ['DRFHoleFits', ''])
test('DRFPartialFields', normal, compile_fail, [''])
test('T16745', extra_files(['T16745C.hs', 'T16745B.hs']), multimod_compile_fail, ['T16745A', ''])
+test('FieldSelectors', normal, compile_fail, [''])
+test('NoFieldSelectorsFail', normal, multimod_compile_fail, ['NoFieldSelectorsFail','-v0'])
+test('NFSSuppressed', normal, compile_fail, [''])
+test('NFSMixed', normal, multimod_compile_fail, ['NFSMixed','-v0'])
test('DRF9156', normal, compile_fail, [''])
+test('NFS9156', normal, compile_fail, [''])
+test('NFSDuplicate', normal, compile_fail, [''])
+test('NFSExport', normal, compile_fail, [''])
+test('T18999_NoDisambiguateRecordFields', normal, compile_fail, [''])
diff --git a/testsuite/tests/overloadedrecflds/should_fail/overloadedrecfldsfail14.stderr b/testsuite/tests/overloadedrecflds/should_fail/overloadedrecfldsfail14.stderr
index 908996f39e..7a211fd366 100644
--- a/testsuite/tests/overloadedrecflds/should_fail/overloadedrecfldsfail14.stderr
+++ b/testsuite/tests/overloadedrecflds/should_fail/overloadedrecfldsfail14.stderr
@@ -1,5 +1,5 @@
overloadedrecfldsfail14.hs:12:7: error:
- ‘y’ is not a record selector
+ No type has all these fields: ‘x’, ‘y’
In the expression: r {x = 3, y = False}
In an equation for ‘f’: f r = r {x = 3, y = False}