Add correct indent for "if" inside a "->" block

elixir-smie.el

@@ -455,6 +455,17 @@
       (t elixir-smie-indent-basic)))
     (`(:before . "if")
      (cond
+      ;; Indent when if is inside a `->' block
+      ;;
+      ;; Example:
+      ;;
+      ;; whatever ->
+      ;;   if true do <-
+      ;;     :foo
+      ;;   end
+      ;;   ....
+      ((elixir-smie-last-line-end-with-block-operator-p)
+       (smie-rule-parent elixir-smie-indent-basic))
       (t
        (smie-rule-parent))))
     (`(:before . "->")

test/elixir-mode-indentation-test.el

@@ -1333,6 +1333,37 @@ defmodule MyModule do
 end
 ")
 
+(elixir-def-indentation-test complex-case-with-matches/4
+                             (:tags '(indentation))
+"
+case :foo do
+1 ->
+ try true do
+        :foo
+end
+2 ->
+false
+end
+
+fn x ->
+if true do
+end
+   end"
+"
+case :foo do
+  1 ->
+    try true do
+      :foo
+    end
+  2 ->
+    false
+end
+
+fn x ->
+  if true do
+  end
+end")
+
 (elixir-def-indentation-test close-map-curly-brackt
                              (:tags '(indentation))
 "