[elpa] externals/parser-generator updated (0d4b9a42ea -> b3ccfb68d5)

[Christian Johansson]

cjohansson pushed a change to branch externals/parser-generator.

      from  0d4b9a42ea Updated version and dates
       new  4534b1f192 Lexer get token function now accepts nil as the 
semantical value for a token
       new  fb7f435738 Added invalid grammar explanation message
       new  b3ccfb68d5 Updated version and modified date


Summary of changes:
 docs/Lexical-Analysis.md         |  4 +++
 parser-generator-lex-analyzer.el |  8 +----
 parser-generator-lr-export.el    |  2 --
 parser-generator.el              | 66 +++++++++++++++++++++++++++++++++++++---
 test/parser-generator-test.el    | 45 +++++++++++++++++++++++++++
 5 files changed, 112 insertions(+), 13 deletions(-)