From: "MaxLap (Maxime Lapointe) via ruby-core" <ruby-core@...>
Date: 2024-02-24T21:01:03+00:00
Subject: [ruby-core:116930] [Ruby master Bug#20296] Complex(:sym, exception: false) generate exception with weird timing

Issue #20296 has been reported by MaxLap (Maxime Lapointe).

----------------------------------------
Bug #20296: Complex(:sym, exception: false) generate exception with weird timing
https://bugs.ruby-lang.org/issues/20296

* Author: MaxLap (Maxime Lapointe)
* Status: Open
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Happens in Ruby 3.2.2, 3.2.3 and 3.3.0 (didn't test others).

Add this to a file and execute it as-is:

```
3.times { Complex(:sym, exception: false) }
puts "hi"
```

The output will be:

```
$ ruby local2.rb
hi
local2.rb:1:in `Complex': can't convert Array into Complex (TypeError)

3.times { Complex([], exception: false) }
                  ^^^^^^^^^^^^^^^^^^^^
        from local2.rb:1:in `block in <main>'
        from local2.rb:1:in `times'
        from local2.rb:1:in `<main>'
local2.rb:1:in `Complex': can't convert Array into Complex (TypeError)

3.times { Complex([], exception: false) }
                  ^^^^^^^^^^^^^^^^^^^^
        from local2.rb:1:in `block in <main>'
        from local2.rb:1:in `times'
        from local2.rb:1:in `<main>'
local2.rb:1:in `Complex': can't convert Array into Complex (TypeError)

3.times { Complex([], exception: false) }
                  ^^^^^^^^^^^^^^^^^^^^
        from local2.rb:1:in `block in <main>'
        from local2.rb:1:in `times'
        from local2.rb:1:in `<main>'
```

So the exception is still reported (instead of being swallow), but the puts, which is after, had the time to execute first. I can even put a `sleep()` in between and the exceptions are still reported after the puts.

In a IRB, there is no exception at all and everything seems to work as expected.

Happens if I pass in an Array too. Doesn't seem to happen with bad strings.

There is also a quadratic behavior somewhere in there. Running the code in an IRB (which doesn't show exceptions), if you double the number of `times` in the loop, it takes 4x as long. This is probably related...



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