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dialyzer: Fix bug in bind_checked_inf/4 #6588

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jhogberg merged 2 commits into from
Dec 22, 2022
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dialyzer: Fix bug in bind_checked_inf/4 #6588

jhogberg merged 2 commits into from
Dec 22, 2022

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@jhogberg jhogberg commented Dec 21, 2022 •
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?unit can't be bound any more than ?none can.

While we're at it, rename t_is_none_or_unit/1 to t_is_impossible/1 because the former is as silly as saying t_is_integer_or_float/1 instead of t_is_number/1.

Fixes #6580

@jhogberg jhogberg added team:VM Assigned to OTP team VM fix testing currently being tested, tag is used by OTP internal CI labels Dec 21, 2022
@jhogberg jhogberg requested a review from bjorng December 21, 2022 07:45
@jhogberg jhogberg self-assigned this Dec 21, 2022
@jhogberg jhogberg mentioned this pull request Dec 21, 2022
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github-actions bot commented Dec 21, 2022 •
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CT Test Results

       5 files     137 suites   42m 23s ⏱️
2 295 tests 2 220 ✔️ 72 💤 3 ❌
2 679 runs  2 598 ✔️ 78 💤 3 ❌

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@jhogberg jhogberg linked an issue Dec 21, 2022 that may be closed by this pull request
[dialyzer] crash in erl_types:cons_hd #6580
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aronisstav commented Dec 21, 2022

Fair point about the name of the none or unit, but maybe t_is_bottom is even better?

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jhogberg commented Dec 21, 2022 •
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I thought about that and it didn't feel right to have "two" bottom types, but I'll happily change it if that's what everyone else prefers.

Edit: to elaborate, the lattice can only have one bottom type, so if I saw t_is_bottom/1 I'd have a hard time not reading it as t_is_none/1. I thought t_is_impossible/1 was an okay name since both ?unit and ?none describe a value that cannot exist.

@jhogberg jhogberg force-pushed the john/dialyzer/erl_types-cons_hd-crash/GH-6580/OTP-18372 branch from 27c1c63 to 4921ae8 Compare December 21, 2022 08:59
@jhogberg
dialyzer_dataflow: Fix bug in bind_checked_inf/4
3dc51db 
`unit` can't be bound any more than `none` can.

This resulted in slightly improved analysis in some cases, taking
notice of more functions in OTP that lacked a local return, so I've
added specs to those functions in order to silence the warnings.

The pattern for that is:

```erlang
try function_that_returns_unit() catch _:_ -> error(xyz) end
```

Previously, this expression was treated as returning unit() even
though it could only ever return none(), as the wrapped function
would never return.
@jhogberg
dialyzer: Rename t_is_none_or_unit/1 to t_is_impossible/1
0c59cb0 
Calling this function t_is_none_or_unit/1 is like saying
t_is_integer_or_float/1 instead of t_is_number/1. I wouldn't be
the least bit surprised if this weird naming was the root cause of
erlangGH-6580.
@jhogberg jhogberg force-pushed the john/dialyzer/erl_types-cons_hd-crash/GH-6580/OTP-18372 branch from 4921ae8 to 0c59cb0 Compare December 21, 2022 09:01
@jhogberg jhogberg added this to the OTP-25.3 milestone Dec 22, 2022
@jhogberg jhogberg merged commit 348718d into erlang:maint Dec 22, 2022
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@bjorng bjorng bjorng approved these changes

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fix team:VM Assigned to OTP team VM testing currently being tested, tag is used by OTP internal CI

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[dialyzer] crash in erl_types:cons_hd

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