Fix #246 (#252)

* Fix #246

`getTypeLHsBind` returned a single span corresponding to the overall function
binding. The fix drills down into the individual matches and returns a span for
each of them.

Fixes #246.

* Make it work on GHC 8.8

* Cosmetics

Author: jacg

Diff for: src/Development/IDE/Spans/Calculate.hs

@@ -98,8 +98,9 @@ getTypeLHsBind :: (GhcMonad m)
                => TypecheckedModule
                -> LHsBind GhcTc
                -> m [(SpanSource, SrcSpan, Maybe Type)]
-getTypeLHsBind _ (L _spn FunBind{fun_id = pid,fun_matches = MG{}}) =
-  return [(Named $ getName (unLoc pid), getLoc pid, Just (varType (unLoc pid)))]
+getTypeLHsBind _ (L _spn FunBind{ fun_id = pid
+                                , fun_matches = MG{mg_alts=(L _ matches)}}) =
+  return [(Named (getName (unLoc pid)), getLoc match, Just (varType (unLoc pid))) | match <- matches ]
 getTypeLHsBind _ _ = return []
 
 -- | Get the name and type of an expression.

Diff for: test/exe/Main.hs

@@ -796,28 +796,28 @@ findDefinitionAndHoverTests = let
   mkFindTests
   --     def    hover  look   expect
   [ test yes    yes    fffL4  fff    "field in record definition"
-  , test broken broken fffL8  fff    "field in record construction #71"
-  , test yes    yes    fffL14 fff    "field name used as accessor"   -- 120 in Calculate.hs
-  , test yes    yes    aaaL14 aaa    "top-level name"                -- 120
-  , test broken broken dcL7   tcDC   "record data constructor #247"
-  , test yes    yes    dcL12  tcDC   "plain  data constructor"       -- 121
-  , test yes    broken tcL6   tcData "type constructor #249"         -- 147
-  , test broken broken xtcL5  xtc    "type constructor from other package #249"
-  , test broken yes    xvL20  xvMsg  "value from other package #249" -- 120
-  , test yes    yes    vvL16  vv     "plain parameter"               -- 120
-  , test yes    yes    aL18   apmp   "pattern match name"            -- 120
-  , test yes    yes    opL16  op     "top-level operator"            -- 120, 123
-  , test yes    yes    opL18  opp    "parameter operator"            -- 120
-  , test yes    yes    b'L19  bp     "name in backticks"             -- 120
-  , test yes    broken clL23  cls    "class in instance declaration #250"
-  , test yes    broken clL25  cls    "class in signature #250"       -- 147
+  , test broken broken fffL8  fff    "field in record construction     #71"
+  , test yes    yes    fffL14 fff    "field name used as accessor"          -- 120 in Calculate.hs
+  , test yes    yes    aaaL14 aaa    "top-level name"                       -- 120
+  , test broken broken dcL7   tcDC   "data constructor record         #247"
+  , test yes    yes    dcL12  tcDC   "data constructor plain"               -- 121
+  , test yes    broken tcL6   tcData "type constructor                #249" -- 147
+  , test broken broken xtcL5  xtc    "type constructor external       #249"
+  , test broken yes    xvL20  xvMsg  "value external package          #249" -- 120
+  , test yes    yes    vvL16  vv     "plain parameter"                      -- 120
+  , test yes    yes    aL18   apmp   "pattern match name"                   -- 120
+  , test yes    yes    opL16  op     "top-level operator"                   -- 120, 123
+  , test yes    yes    opL18  opp    "parameter operator"                   -- 120
+  , test yes    yes    b'L19  bp     "name in backticks"                    -- 120
+  , test yes    broken clL23  cls    "class in instance declaration   #250"
+  , test yes    broken clL25  cls    "class in signature              #250" -- 147
   , test broken broken eclL15 ecls   "external class in signature #249,250"
-  , test yes    yes    dnbL29 dnb    "do-notation   bind"            -- 137
+  , test yes    yes    dnbL29 dnb    "do-notation   bind"                   -- 137
   , test yes    yes    dnbL30 dnb    "do-notation lookup"
-  , test yes    yes    lcbL33 lcb    "listcomp   bind"               -- 137
+  , test yes    yes    lcbL33 lcb    "listcomp   bind"                      -- 137
   , test yes    yes    lclL33 lcb    "listcomp lookup"
   , test yes    yes    mclL36 mcl    "top-level fn 1st clause"
-  , test broken broken mclL37 mcl    "top-level fn 2nd clause #245"
+  , test yes    yes    mclL37 mcl    "top-level fn 2nd clause         #246"
   ]
   where yes, broken :: (TestTree -> Maybe TestTree)
         yes    = Just -- test should run and pass