Fix for #1150: String interpolation regression

lib/lexer.js

@@ -476,7 +476,7 @@
             end = stack[stack.length - 1];
             continue;
         }
-        if (end === '}' && (letter === '"' || letter === "'")) {
+        if (end === '}' && (letter === '"' || letter === "'" || letter === '/')) {
           stack.push(end = letter);
         } else if (end === '}' && letter === '{') {
           stack.push(end = '}');

src/lexer.coffee

@@ -412,7 +412,7 @@ exports.Lexer = class Lexer
             return str.slice 0, i + 1
           end = stack[stack.length - 1]
           continue
-      if end is '}' and letter in ['"', "'"]
+      if end is '}' and letter in ['"', "'", '/']
         stack.push end = letter
       else if end is '}' and letter is '{'
         stack.push end = '}'

test/interpolation.coffee

@@ -20,6 +20,11 @@ eq "#{ "{" }", "{"
 eq "#{ '#{}}' } }", '#{}} }'
 eq "#{"'#{ ({a: "b#{1}"}['a']) }'"}", "'b1'"
 
+# Issue 1150: String interpolation regression
+eq "#{/'/.test ''}", 'false'
+eq "#{"'/" + '/"' + /"'/.test ''}", '\'//"false'
+eq "#{"'/"}#{'/"'}#{/"'/.test ''}", '\'//"false'
+
 hello = 'Hello'
 world = 'World'
 ok '#{hello} #{world}!' is '#{hello} #{world}!'