From: "watson1978 (Shizuo Fujita) via ruby-core" <ruby-core@...>
Date: 2025-02-13T02:44:35+00:00
Subject: [ruby-core:120963] [Ruby master Bug#21132] Changed postposition `rescue` and `if` behavior since Ruby 3.4

Issue #21132 has been updated by watson1978 (Shizuo Fujita).


When I switched parser to parse.y, it has same result with Ruby 3.3.

```
[~/tmp]$ ruby -v --parser=parse.y t.rb
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) [x86_64-linux]
"fugafuga"
[~/tmp]$ ruby -v --parser=prism t.rb
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux]
"hogehoge"
```

----------------------------------------
Bug #21132: Changed postposition `rescue` and `if` behavior since Ruby 3.4
https://bugs.ruby-lang.org/issues/21132#change-111860

* Author: watson1978 (Shizuo Fujita)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
When I use postposition `rescue` and `if` at same line, the behavior is changed since Ruby 3.4.

## Reproduction
```ruby
def foo
  return "hogehoge" rescue nil if false
  return "fugafuga"
end

foo
```

## Result with Ruby 3.3
```
irb(main):001> RUBY_VERSION
=> "3.3.6"
irb(main):002* def foo
irb(main):003*   return "hogehoge" rescue nil if false
irb(main):004*   return "fugafuga"
irb(main):005> end
=> :foo
irb(main):006> foo
=> "fugafuga"
```

YARV bytecode
```
ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [x86_64-linux]
== disasm: #<ISeq:<compiled>@<compiled>:1 (1,0)-(6,3)>
0000 definemethod                           :foo, foo                 (   1)[Li]
0003 putself                                                          (   6)[Li]
0004 opt_send_without_block                 <calldata!mid:foo, argc:0, FCALL|VCALL|ARGS_SIMPLE>
0006 leave

== disasm: #<ISeq:foo@<compiled>:1 (1,0)-(4,3)>
0000 putstring                              "fugafuga"                (   3)[LiCa]
0002 leave                                                            (   4)[Re]
```

## Result with Ruby 3.4
```
irb(main):001> RUBY_VERSION
=> "3.4.1"
irb(main):002* def foo
irb(main):003*   return "hogehoge" rescue nil if false
irb(main):004*   return "fugafuga"
irb(main):005> end
=> :foo
irb(main):006> foo
=> "hogehoge"
```

YARV bytecode
```
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [x86_64-linux]
== disasm: #<ISeq:<compiled>@<compiled>:1 (1,0)-(1,54)>
0000 putself                                                          (   1)[Li]
0001 opt_getconstant_path                   <ic:0 RubyVM::InstructionSequence>
0003 opt_getconstant_path                   <ic:1 DATA>
0005 opt_send_without_block                 <calldata!mid:new, argc:1, ARGS_SIMPLE>
0007 opt_send_without_block                 <calldata!mid:disassemble, argc:0, ARGS_SIMPLE>
0009 opt_send_without_block                 <calldata!mid:puts, argc:1, FCALL|ARGS_SIMPLE>
```



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