unterminated -> missing.

lib/lexer.js

@@ -472,7 +472,7 @@
         }
         prev = letter;
       }
-      throw new Error("unterminated " + (stack.pop()[0]) + " on line " + (this.line + 1));
+      throw new Error("missing " + (stack.pop()[0]) + ", starting on line " + (this.line + 1));
     };
     Lexer.prototype.interpolateString = function(str, options) {
       var expr, heredoc, i, inner, interpolated, letter, nested, pi, regex, tag, tokens, value, _len, _ref, _ref2, _ref3;

src/lexer.coffee

@@ -407,7 +407,7 @@ exports.Lexer = class Lexer
       else if end is '"' and prev is '#' and letter is '{'
         stack.push end = '}'
       prev = letter
-    throw new Error "unterminated #{ stack.pop()[0] } on line #{ @line + 1 }"
+    throw new Error "missing #{ stack.pop()[0] }, starting on line #{ @line + 1 }"
 
 
   # Expand variables and expressions inside double-quoted strings using