Fix do let comment indentation problems

src-unittests/IdentityTests.hs

@@ -627,3 +627,13 @@ regressionTests = do
         RepoLocal { abc } -> return ()
         RepoLocal{}       -> return ()
       |]
+  it "do let comment indentation level problem" $ do
+    roundTripEqual $
+      [text|
+      func = do
+        let (primaryPkg, otherPkgs)   = selectPrimaryLocalPackage pwd pkgs'
+            (bproblems, x) = resolveBuildTargets primaryPkg otherPkgs utargets''
+            -- default local dir target if there's no given target
+            utargets''                = "foo"
+        return ()
+      |]

src/Language/Haskell/Brittany/Layouters/Stmt.hs

@@ -62,20 +62,11 @@ layoutStmt lstmt@(L _ stmt) = docWrapNode lstmt $ case stmt of
         (docLit $ Text.pack "let")
         (docSetIndentLevel $ return bindDoc)
       ]
-    Just bindDocs@(bindDoc1:bindDocr) -> do
-      -- TODO: the indentation here is screwed up. needs docSetIndentLevel and
-      -- SetBaseY based layouting, not cols.
-      docSetBaseY $ docAlt
-        [ docLines
-        $ (docCols ColDoLet
+    Just bindDocs -> docAlt
+      [ docSeq
         [ appSep $ docLit $ Text.pack "let"
-            , docSetIndentLevel $ return bindDoc1
-            ])
-        : (bindDocr <&> \bindDoc ->
-           docCols ColDoLet
-            [ docEnsureIndent (BrIndentSpecial 4) docEmpty
-            , docSetIndentLevel $ return bindDoc
-            ])
+        , docSetIndentLevel $ docLines $ return <$> bindDocs
+        ]
       , docAddBaseY BrIndentRegular
       $ docPar
         (docLit $ Text.pack "let")