Simplify code

src/Ansi.elm

@@ -5,7 +5,7 @@ module Ansi exposing (backgroundRed, bold, cyan, red, yellow)
 
 bold : String -> String
 bold text =
-    String.join "" [ "\u{001B}[1m", text, "\u{001B}[22m" ]
+    String.concat [ "\u{001B}[1m", text, "\u{001B}[22m" ]
 
 
 
@@ -14,7 +14,7 @@ bold text =
 
 applyColor : String -> String -> String
 applyColor color string =
-    String.join "" [ "\u{001B}[" ++ color ++ "m", string, noColor ]
+    String.concat [ "\u{001B}[" ++ color ++ "m", string, noColor ]
 
 
 red : String -> String
@@ -43,7 +43,7 @@ noColor =
 
 applyBackgroundColor : String -> String -> String
 applyBackgroundColor color string =
-    String.join "" [ "\u{001B}[" ++ color ++ "m", string, noBackgroundColor ]
+    String.concat [ "\u{001B}[" ++ color ++ "m", string, noBackgroundColor ]
 
 
 backgroundRed : String -> String

src/Review/Rule.elm

@@ -765,7 +765,7 @@ duplicateModulesGlobalError duplicate =
             duplicate.paths
                 |> List.sort
                 |> List.map (\s -> "\n  - " ++ s)
-                |> String.join ""
+                |> String.concat
     in
     elmReviewGlobalError
         { message = "Found several modules named `" ++ String.join "." duplicate.moduleName ++ "`"
@@ -3678,12 +3678,7 @@ runProjectVisitor name projectVisitor maybePreviousCache exceptions project node
 
         errors : List (Error {})
         errors =
-            case projectVisitor.traversalAndFolder of
-                TraverseAllModulesInParallel _ ->
-                    Exceptions.apply exceptions (accessInternalError >> .filePath) (errorsFromCache newCache)
-
-                TraverseImportedModulesFirst _ ->
-                    Exceptions.apply exceptions (accessInternalError >> .filePath) (errorsFromCache newCache)
+            Exceptions.apply exceptions (accessInternalError >> .filePath) (errorsFromCache newCache)
     in
     { errors = List.map (setRuleName name) errors
     , rule =

src/Review/Test/FailureMessage.elm

@@ -90,7 +90,7 @@ The source code in question is the one at index """
                     ++ """ starting with:
 
   `"""
-                    ++ (String.join "" <| List.take 1 <| String.split "\n" <| String.trim source)
+                    ++ (String.concat <| List.take 1 <| String.split "\n" <| String.trim source)
                     ++ "`"
     in
     failureMessage "TEST SOURCE CODE PARSING ERROR" (details ++ "\n\n" ++ hint)

tests/NoUnused/CustomTypeConstructorArgs.elm

@@ -531,8 +531,7 @@ collectUsedCustomTypeArgs lookupTable (Node range pattern) =
             in
             case ModuleNameLookupTable.moduleNameAt lookupTable range of
                 Just moduleName ->
-                    [ ( ( moduleName, name ), usedPositions ) ]
-                        ++ subList
+                    ( ( moduleName, name ), usedPositions ) :: subList
 
                 Nothing ->
                     subList