Issues

• Quoted terminals are not escaped in --glr mode

  haskell/happy#356 · Filter by author yaitskov opened on May 4, 2026

• Happy and haskell-src-exts differ by shift/reduce conflicts

  haskell/happy#354 · Filter by author tbidne opened on Apr 7, 2026
  3

• reduce/reduce conflict handling order: difference in documentation vs. code

  haskell/happy#350 · Filter by author BestYeen opened on Mar 2, 2026

• Strict mode is not in fact strict

  haskell/happy#346 · Filter by author dcoutts opened on Nov 28, 2025
  4

• Feature Request: Add ability to generate lazily generated list of data structures.

  haskell/happy#338 · Filter by author noahmartinwilliams opened on Jun 10, 2025

• Explicitly set text encoding to utf-8?

  haskell/happy#337 · Filter by author wz1000 opened on May 15, 2025
  1

• Fin n for array indexes?

  haskell/happy#313 · Filter by author Ericson2314 opened on Sep 23, 2024
  6

• Code blocks should strip alignment of opening brace

  haskell/happy#305 · Filter by author sgraf812 opened on Sep 20, 2024

• Ignore individual warnings in generated code, rather than all warnings.

  enhancement
  haskell/happy#294 · Filter by author sgraf812 opened on Sep 13, 2024

• Happy-generated code fails with Internal Happy error with -XStrictData

  documentationenhancement
  haskell/happy#273 · Filter by author BjoernLoetters opened on Mar 14, 2024 · 2.0
  17

• Expected list of tokens provided by %errordefaulthandler explist only lists shift tokens of most recent state

  re: building happyre: error handler
  haskell/happy#265 · Filter by author sgraf812 opened on Jan 24, 2024
  3

• Grammar that bison/byacc reports 35 reduce/reduce conflicts but happy none

  haskell/happy#260 · Filter by author mingodad opened on Nov 16, 2023
  5

• Idea: Backend for generating railroad diagrams

  haskell/happy#244 · Filter by author sgraf812 opened on Jan 10, 2023
  3

• Incremental parsing

  haskell/happy#240 · Filter by author Ericson2314 opened on Aug 22, 2022

• Split up CLI into packages

  haskell/happy#239 · Filter by author knothed opened on Jun 21, 2022
  2

• Implement something like "Principled parsing for indentation-sensitive languages"

  haskell/happy#235 · Filter by author TeofilC opened on Apr 22, 2022
  8

• Documentation: Constraints on Parser Monad

  haskell/happy#231 · Filter by author pnotequalnp opened on Mar 15, 2022

• inclarity in threaded lexer docs leads to confusing failure

  haskell/happy#227 · Filter by author xplat opened on Mar 6, 2022
  3

• Old TODO

  haskell/happy#208 · Filter by author Ericson2314 opened on Oct 17, 2021

• Support parser rule includes/modules

  haskell/happy#198 · Filter by author raehik opened on Aug 11, 2021
  2

• Examples don't work

  haskell/happy#197 · Filter by author knothed opened on Jul 23, 2021
  4

• conflicts between documentation

  haskell/happy#194 · Filter by author leo-mao opened on Jun 21, 2021

• Default backend should generate TemplateHaskell and write that to a file

  haskell/happy#190 · Filter by author sgraf812 opened on Apr 25, 2021
  3

• GLR: generated file *Data.hs doesn't declare its OPTIONS and LANGUAGE pragmas

  haskell/happy#183 · Filter by author andreasabel opened on Feb 14, 2021

• GLR_Lib.hs "Couldn't match expected type ‘Bool’ with actual type ‘Int#’"

  haskell/happy#173 · Filter by author andreasabel opened on Oct 13, 2020
  5