leading `then` is now valid

lib/rewriter.js

@@ -228,6 +228,10 @@
     return this.scanTokens(function(token, i, tokens) {
       var _ref, _ref2, action, condition, indent, outdent, starter, tag;
       tag = token[0];
+      if (tag === 'TERMINATOR' && this.tag(i + 1) === 'THEN') {
+        tokens.splice(i, 1);
+        return 0;
+      }
       if (tag === 'ELSE' && this.tag(i - 1) !== 'OUTDENT') {
         tokens.splice.apply(tokens, [i, 0].concat(this.indentation(token)));
         return 2;

src/nodes.coffee

@@ -715,9 +715,8 @@ exports.Class = class Class extends Base
           ctor.body.unshift new Literal "this.#{pname} = function() { #{ret} }"
       if pvar
         access = if prop.context is 'this'
-          pvar.properties[0]
-        else
-          new Accessor pvar, 'proto'
+        then pvar.properties[0]
+        else new Accessor pvar, 'proto'
         val  = new Value variable, [access]
         prop = new Assign val, func
       props.push prop

src/rewriter.coffee

@@ -194,6 +194,9 @@ class exports.Rewriter
   addImplicitIndentation: ->
     @scanTokens (token, i, tokens) ->
       [tag] = token
+      if tag is 'TERMINATOR' and @tag(i + 1) is 'THEN'
+        tokens.splice i, 1
+        return 0
       if tag is 'ELSE' and @tag(i - 1) isnt 'OUTDENT'
         tokens.splice i, 0, @indentation(token)...
         return 2

test/test_if.coffee

@@ -131,6 +131,9 @@ result =
 
 ok result is 70
 
+if 'tight formatting with leading `then` is allowed'
+then ok    'yay'
+else throw 'boo'
 
 # Issue #738
 func = if true then -> 1