#1026

lib/grammar.js

@@ -481,12 +481,12 @@
         return $1.addElse(new If($4, $5, {
           type: $3
         }));
-      }), o('IfBlock ELSE Block', function() {
-        return $1.addElse($3);
       })
     ],
     If: [
-      o('IfBlock'), o('Statement  POST_IF Expression', function() {
+      o('IfBlock'), o('IfBlock ELSE Block', function() {
+        return $1.addElse($3);
+      }), o('Statement  POST_IF Expression', function() {
         return new If($3, Expressions.wrap([$1]), {
           type: $2,
           statement: true

src/grammar.coffee

@@ -483,13 +483,13 @@ grammar =
   IfBlock: [
     o 'IF Expression Block',                    -> new If $2, $3, type: $1
     o 'IfBlock ELSE IF Expression Block',       -> $1.addElse new If $4, $5, type: $3
-    o 'IfBlock ELSE Block',                     -> $1.addElse $3
   ]
 
   # The full complement of *if* expressions, including postfix one-liner
   # *if* and *unless*.
   If: [
     o 'IfBlock'
+    o 'IfBlock ELSE Block',                     -> $1.addElse $3
     o 'Statement  POST_IF Expression',          -> new If $3, Expressions.wrap([$1]), type: $2, statement: true
     o 'Expression POST_IF Expression',          -> new If $3, Expressions.wrap([$1]), type: $2, statement: true
   ]

test/compilation.coffee

@@ -45,3 +45,13 @@ eq λ, 5
 
 test "don't accidentally stringify keywords", ->
   ok (-> this == 'this')() is false
+
+test "#1026", ->
+  cantCompile '''
+    if a
+      b
+    else
+      c
+    else
+      d
+  '''