Bug #15389: 9 elements or more larger Hash doesn't show an entry

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.6.0dev (2018-12-05 trunk 66213) [x86_64-linux]
• Backport: 2.4: UNKNOWN, 2.5: UNKNOWN

[kou (Kouhei Sutou)]

I don't know this problem is a problem of Racc or Ruby itself yet but I'll share this.

Here is a Ruby script that reproduce this case:

require "racc/grammar"

hash = {}
[
  [false, 0],
  [:error, 1],
  [:END, 2],
  [:CLASS, 3],
  [:RULE, 4],
  [:"<", 5],
  [:SYMBOL, 6],
  [:":", 7],
  [:CONV, 8],
].each do |value, ident|
  sym = Racc::Sym.new(value, false)
  sym.ident = ident
  hash[sym] = ident
end
p hash

It outputs the following:

{error=>1, END=>2, CLASS=>3, RULE=>4, <=>5, SYMBOL=>6, :=>7, CONV=>8}

It doesn't have an entry for [false, 0].

If we reduce the last entry ([:CONV, 8]), we can see the entry for [false, 0]:

require "racc/grammar"

hash = {}
[
  [false, 0],
  [:error, 1],
  [:END, 2],
  [:CLASS, 3],
  [:RULE, 4],
  [:"<", 5],
  [:SYMBOL, 6],
  [:":", 7],
].each do |value, ident|
  sym = Racc::Sym.new(value, false)
  sym.ident = ident
  hash[sym] = ident
end
p hash

{$end=>0, error=>1, END=>2, CLASS=>3, RULE=>4, <=>5, SYMBOL=>6, :=>7}

($end=>0 is the entry for [false, 0].)

This is occurred since r65454.

[kou (Kouhei Sutou)]

• Subject changed from 8 elements or more larger Hash doesn't show an entry to 9 elements or more larger Hash doesn't show an entry

[Hanmac (Hans Mackowiak)]

@kou (Kouhei Sutou) you need to debug what sym is, it looks like that it thinks that some of them are already existing

it might also be a bad idea to use such objects as hash keys?

Or debug why hash thinks it already has that key?

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r66274.

---

Adjust reserved hash values

The reserved hash values in hash.c must be consistend with st.c.
[ruby-core:90356] [Bug #15389]