missing entry in expected array when --cache flag is used

Issue type

Bug Report:

Prerequisites

• Can you reproduce the issue?: yes
• Did you search the repository issues?: yes
• Did you check the forums?: yes
• Did you perform a web search (google, yahoo, etc)?: yes

Description

expected entry disappears when cache option is turned on

Steps to Reproduce

1. Paste following grammar to online version
2. Type SELECT a in Test textarea (space at the end is important)
3. It shows Line 1, column 10: Expected ",", "AS", "FROM", or Alias but end of input found. which is perfect!
4. Select Use results cache checkbox at the bottom of the page.
5. Now error looks like: Line 1, column 10: Expected ",", "AS", or Alias but end of input found.. The “FROM” part is missing, but it should still be present.

GRAMMAR:

start = SELECT _ c:columns f:from? {return {c, f};}

from
 = _ FROM _ x:identifier {return x}

columns
  = c:column _ "," _ cs:columns {return [c, ...cs];}
  / c:column {return [c]}

column
  = i:identifier alias? {return i}
  
alias
  = _ ("AS"i _)? aliasName
  
aliasName "Alias"
  = identifier

identifier "Identifier"
  = !keywords x:namechar+ {return x.join('')}

keywords
  = SELECT / FROM

SELECT
  = "SELECT"i

FROM
  = "FROM"i !namechar

namechar
  = [a-zA-Z]

_ "whitespace"
  = [ \t\n\r]*

[Mingun]

Simplified case:

start = !a 'b' / a;
a = 'a';

With no input gives:

cache	error
off	Line 1, column 1: Expected “a” or “b” but end of input found.
on	Line 1, column 1: Expected “b” but end of input found.

[StoneCypher]

Ok.