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fixes #10440, fixes #13871, fixes #14665, fixes #19672, fixes #23677
The false positive in #23677 was caused by behavior in
`implicitlyDiscardable` where only the last node of `if`/`case`/`try`
etc expressions were considered, as in the final node of the final
branch (in this case `else`). To fix this we use the same iteration in
`implicitlyDiscardable` that we use in `endsInNoReturn`, with the
difference that for an `if`/`case`/`try` statement to be implicitly
discardable, all of its branches must be implicitly discardable.
`noreturn` calls are also considered implicitly discardable for this
reason, otherwise stuff like `if true: discardableCall() else: error()`
doesn't compile.
However `endsInNoReturn` also had bugs, one where `finally` was
considered in noreturn checking when it shouldn't, another where only
`nkIfStmt` was checked and not `nkIfExpr`, and the node given for the
error message was bad. So `endsInNoReturn` now skips over
`skipForDiscardable` which no longer contains
`nkIfStmt`/`nkCaseStmt`/`nkTryStmt`, stores the first encountered
returning node in a var parameter for the error message, and handles
`finally` and `nkIfExpr`.
Fixing #23677 already broke a line in `syncio` so some package code
might be affected.
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## Reprodution
if on Windows:
```Nim
when defined(windows):
var file: File
let succ = file.open(<aFileHandle>)
```
then `succ` will be false.
If tested, it can be found to fail with errno `22` and message: `Invalid
argument`
## Problem
After some investigations and tests,
I found it's due to the `mode` argument for `fdopen`.
Currently `NoInheritFlag`(`'N'` in Windows) is added to `mode` arg
passed to `_fdopen`, but if referring to
[Windows `_fdopen`
doc](https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/fdopen-wfdopen?view=msvc-170),
you'll find there is no `'N'` describled. That's `'N'` is not accepted
by `_fdopen`.
Therefore, the demo above will fail.
## In Addition
To begin with, technologically speaking, when opening with a
`fileHandle`(or called `fd`), there is no concept of fd-inheritable as
`fd` is opened already.
In POSIX, `NoInheritFlag` is defined as `e`.
It's pointed out in [POSIX `open`
man-doc](https://www.man7.org/linux/man-pages/man3/fopen.3.html) that
`e` in mode is ignored for fdopen(),
which means `e` for `fdopen()` is not wanted, just allowed.
Therefore, better to also not pass `e` to `fdopen`
---
In all, that's this PR.
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fixes #22166
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follow up #22380
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Per manual, `panics:on` affects _only_ `Defect`:s - thus `sysFatal`
should not redirect any other exceptions.
Also, when `sysFatal` is used in `nimPanics` mode, it should use regular
exception handling pipeline to ensure exception hooks are called
consistently for all raised defects.
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fixes #22700
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fixes #21273; io.readLine off by one
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Update syncio.nim
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* fix =#13790 ptr char (+friends) should not implicitly convert to cstring
* Apply suggestions from code review
* first round; compiles on windows
* nimPreviewSlimSystem
* conversion is unsafe, cast needed
* fixes more tests
* fixes asyncnet
* another try another error
* last one
* true
* one more
* why bugs didn't show at once
* add `nimPreviewCstringConversion` switch
* typo
* fixes ptr to cstring warnings[backport]
* add fixes
Co-authored-by: xflywind <43030857+xflywind@users.noreply.github.com>
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* fix fwrite prototype
* Update lib/std/syncio.nim
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
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* move widestrs out of system
* fix osproc
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* system refactor, move out 600 lines
* compilation, slice, backwardsindex, misc_num moved out of system
* some procs/types moved into arithmetics, basic_types
* system no longer depends on syncio
* some procs moved around to fit with their surroundings
* make exceptions an import, old ops to misc_num
* move instantiationInfo back
* move back nim version, fix windows echo
* include compilation
* better docs for imported modules, fix unsigned ops
also remove ze, ze64, toU8, toU16, toU32 with nimPreviewSlimSystem
* fix terminal
* workaround IC test & weird csize bug, changelog
* move NimMajor etc back to compilation, rebase for CI
* try ic fix
* form single `indices`, slim out TaintedString, try fix IC
* fix CI, update changelog, addQuitProc
* fix CI
* try fix CI
* actually fix CI finally hopefully
* Update lib/system/compilation.nim
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
* update kochdocs
* hopefully fix csize uses for slimsystem
* fix tquit
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
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This reverts commit 04e4a5ec0e35fc7e1c346c2d002e8487b4b48cb5.
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* fix #19600 No error checking on fclose
* add IOError to open
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* move formatfloat out of system
* fixes doc
* Update changelog.md
* careless
* fixes
* deprecate system/formatfloat
* better handling
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* move io out of system
* fix tests
* fix tests
* next step
* rename to syncio
* rename
* fix nimscript
* comma
* fix
* fix parts of errors
* good for now
* fix test
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