diff --git a/src/Review/Test.elm b/src/Review/Test.elm
index 9780b8ea..c32b995d 100644
--- a/src/Review/Test.elm
+++ b/src/Review/Test.elm
@@ -911,7 +911,7 @@ getCodeAtLocationInSourceCode sourceCode =
                 lastLine : Maybe String
                 lastLine =
                     Array.get (end.row - 1) lines
-                        |> Maybe.map (String.dropRight end.column)
+                        |> Maybe.map (String.left end.column)
             in
             [ [ firstLine ]
             , Array.slice start.row (end.row - 1) lines
diff --git a/tests/MiscRules/NoBooleanCase.elm b/tests/MiscRules/NoBooleanCase.elm
new file mode 100644
index 00000000..bc61e6f1
--- /dev/null
+++ b/tests/MiscRules/NoBooleanCase.elm
@@ -0,0 +1,43 @@
+module MiscRules.NoBooleanCase exposing (rule)
+
+import Elm.Syntax.Expression as Expression exposing (Expression)
+import Elm.Syntax.Node as Node exposing (Node)
+import Elm.Syntax.Pattern as Pattern
+import Elm.Syntax.Range exposing (Range)
+import Review.Rule as Rule exposing (Error, Rule)
+
+
+rule : Rule
+rule =
+    Rule.newModuleRuleSchema "NoBooleanCase" ()
+        |> Rule.withSimpleExpressionVisitor expressionVisitor
+        |> Rule.fromModuleRuleSchema
+
+
+expressionVisitor : Node Expression -> List (Error {})
+expressionVisitor (Node.Node range expression) =
+    case expression of
+        Expression.CaseExpression caseBlock ->
+            errorsForCaseBlock range caseBlock
+
+        _ ->
+            []
+
+
+errorsForCaseBlock : Range -> Expression.CaseBlock -> List (Error {})
+errorsForCaseBlock ({ end } as range) { expression, cases } =
+    case cases of
+        [ ( Node.Node _ (Pattern.NamedPattern { moduleName, name } []), _ ), _ ] ->
+            if moduleName == [] && (name == "True" || name == "False") then
+                [ Rule.error
+                    { message = "Matching boolean values in a case .. of expression"
+                    , details = [ "It's quite silly" ]
+                    }
+                    range
+                ]
+
+            else
+                []
+
+        _ ->
+            []
diff --git a/tests/MiscRules/NoBooleanCaseTest.elm b/tests/MiscRules/NoBooleanCaseTest.elm
new file mode 100644
index 00000000..c23c0e09
--- /dev/null
+++ b/tests/MiscRules/NoBooleanCaseTest.elm
@@ -0,0 +1,31 @@
+module MiscRules.NoBooleanCaseTest exposing (all)
+
+import MiscRules.NoBooleanCase as NoBooleanCase
+import Review.Test
+import Test exposing (Test, describe, test)
+
+
+all : Test
+all =
+    describe "noBooleanCase"
+        [ test "Simple one" <|
+            \_ ->
+                """module A exposing (..)
+a =
+    case expr of
+        True -> True
+        False -> False
+"""
+                    |> Review.Test.run NoBooleanCase.rule
+                    |> Review.Test.expectErrors
+                        [ Review.Test.error
+                            { message = "Matching boolean values in a case .. of expression"
+                            , details =
+                                [ "It's quite silly"
+                                ]
+                            , under = """case expr of
+        True -> True
+        False -> False"""
+                            }
+                        ]
+        ]
diff --git a/tests/NoUnused/VariablesTest.elm b/tests/NoUnused/VariablesTest.elm
index a5e7f50c..9426cca8 100644
--- a/tests/NoUnused/VariablesTest.elm
+++ b/tests/NoUnused/VariablesTest.elm
@@ -555,7 +555,7 @@ import Foo
                     [ Review.Test.error
                         { message = "Imported type `C` is not used"
                         , details = details
-                        , under = "C\n  "
+                        , under = "C\n        ,"
                         }
                         |> Review.Test.whenFixed """module SomeModule exposing (d)
 import Foo