Ruby Issue Tracking System

09/14/2026

08:02 AM Ruby Bug #22294: Parsing a long && / || chain is quadratic

A pull request for compilation: https://github.com/ruby/ruby/pull/18824 make_now_just (Hiroya Fujinami)

07:07 AM Ruby Bug #22313: Bytecode compilation is quadratic in the size of a method due to remove_unreachable_chunk

I created a pull request to fix it: https://github.com/ruby/ruby/pull/18823 make_now_just (Hiroya Fujinami)

06:55 AM Ruby Bug #22313 (Open): Bytecode compilation is quadratic in the size of a method due to remove_unreachable_chunk

Compiling one large method whose body contains many unconditional jumps takes time quadratic in the size of the method.
## Reproduction
```ruby
def build(units)
src = +"def f(x)\n"
units.times do |i|
src << " while x <... make_now_just (Hiroya Fujinami)

09/08/2026

06:40 AM Ruby Revision c9764e85 (git): Avoid quadratic parse time on and/or chains (#18638)

Avoid quadratic parse time on long and/or chains
logop() builds a left-associative and/or chain into a right-leaning
tree, and found the insertion point by walking the whole right spine
from the top on every operator. For a chain such a... make_now_just (Hiroya Fujinami)

09/05/2026

12:59 PM Ruby Revision a946c1bd (git): Report a void value in an and/or chain only once

value_expr_check descended into the left operand of an and/or node,
so a chain such as `x = (return) && (return) && a` reported the same
void value once per operator instead of once. The left operand is
already checked for a value when l... make_now_just (Hiroya Fujinami)

09:18 AM Ruby Revision 8587ce29 (git): [ruby/prism] Avoid quadratic value-expression check on and/or chains

(https://github.com/ruby/prism/pull/4221)
Ref https://bugs.ruby-lang.org/issues/22294
pm_check_value_expression descended the left operand of every and/or
node it visited. Because pm_and_node_create and pm_or_node_create
already assert... make_now_just (Hiroya Fujinami)

05:29 AM Ruby Bug #22294: Parsing a long && / || chain is quadratic

I crated a pull request for each repo:
- https://github.com/ruby/ruby/pull/18638
- https://github.com/ruby/prism/pull/4221
make_now_just (Hiroya Fujinami)

05:09 AM Ruby Bug #22294 (Open): Parsing a long && / || chain is quadratic

Parsing a long chain of short-circuit logical operators (`&&`, `||`, `and`, `or`) takes time that is quadratic in the chain's length.
It affects both parsers, parse.y and Prism.
## Reproduction
```ruby
require "prism"
def benc... make_now_just (Hiroya Fujinami)

04/29/2026

02:09 AM Ruby Revision 493d26dc (git): Reject overflowed repeat/null-check IDs in huge regexps (#16801)

Add explicit errors for excessive range-repeat and null-check IDs;
map new errors in regerror; add regression tests for oversized generated
patterns. make_now_just (Hiroya Fujinami)

11/02/2025

05:05 AM Ruby Revision e02c892a (git): Fix indents in Onigmo files to use spaces instead of tabs (#14047) [no ci]

make_now_just (Hiroya Fujinami)