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rust-cpython: mark all PyLeaked methods as unsafe...
rust-cpython: mark all PyLeaked methods as unsafe Unfortunately, these methods can be abused to obtain the inner 'static reference. The simplest (pseudo-code) example is: let leaked: PyLeaked<&'static _> = shared.leak_immutable(); let static_ref: &'static _ = &*leaked.try_borrow(py)?; // PyLeakedRef::deref() tries to bound the lifetime to itself, but // the underlying data is a &'static reference, so the returned // reference can be &'static. This problem can be easily fixed by coercing the lifetime, but there are many other ways to achieve that, and there wouldn't be a generic solution: let leaked: PyLeaked<&'static [_]> = shared.leak_immutable(); let leaked_iter: PyLeaked<slice::Iter<'static, _>> = unsafe { leaked.map(|v| v.iter()) }; let static_slice: &'static [_] = leaked_iter.try_borrow(py)?.as_slice(); So basically I failed to design the safe borrowing interface. Maybe we'll instead have to add much more restricted interface on top of the unsafe PyLeaked methods? For instance, Iterator::next() could be implemented if its Item type is not &'a (where 'a may be cheated.) Anyway, this seems not an easy issue, so it's probably better to leave the current interface as unsafe, and get broader comments while upstreaming this feature.
Matt Harbison - - Load All Authors

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mercurial.wxs
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<?xml version='1.0' encoding='windows-1252'?>
<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi'>
<!-- Copyright 2010 Steve Borho <steve@borho.org>
This software may be used and distributed according to the terms of the
GNU General Public License version 2 or any later version. -->
<?include guids.wxi ?>
<?include defines.wxi ?>
<?if $(var.Platform) = "x64" ?>
<?define PFolder = ProgramFiles64Folder ?>
<?else?>
<?define PFolder = ProgramFilesFolder ?>
<?endif?>
<Product Id='*'
Name='Mercurial $(var.Version) ($(var.Platform))'
UpgradeCode='$(var.ProductUpgradeCode)'
Language='1033' Codepage='1252' Version='$(var.Version)'
Manufacturer='Matt Mackall and others'>
<Package Id='*'
Keywords='Installer'
Description="Mercurial distributed SCM (version $(var.Version))"
Comments='$(var.Comments)'
Platform='$(var.Platform)'
Manufacturer='Matt Mackall and others'
InstallerVersion='300' Languages='1033' Compressed='yes' SummaryCodepage='1252' />
<Media Id='1' Cabinet='mercurial.cab' EmbedCab='yes' DiskPrompt='CD-ROM #1'
CompressionLevel='high' />
<Property Id='DiskPrompt' Value="Mercurial $(var.Version) Installation [1]" />
<Condition Message='Mercurial MSI installers require Windows XP or higher'>
VersionNT >= 501
</Condition>
<Property Id="INSTALLDIR">
<ComponentSearch Id='SearchForMainExecutableComponent'
Guid='$(var.ComponentMainExecutableGUID)' />
</Property>
<!--Property Id='ARPCOMMENTS'>any comments</Property-->
<Property Id='ARPCONTACT'>mercurial@mercurial-scm.org</Property>
<Property Id='ARPHELPLINK'>https://mercurial-scm.org/wiki/</Property>
<Property Id='ARPURLINFOABOUT'>https://mercurial-scm.org/about/</Property>
<Property Id='ARPURLUPDATEINFO'>https://mercurial-scm.org/downloads/</Property>
<Property Id='ARPHELPTELEPHONE'>https://mercurial-scm.org/wiki/Support</Property>
<Property Id='ARPPRODUCTICON'>hgIcon.ico</Property>
<Property Id='INSTALLEDMERCURIALPRODUCTS' Secure='yes'></Property>
<Property Id='REINSTALLMODE'>amus</Property>
<!--Auto-accept the license page-->
<Property Id='LicenseAccepted'>1</Property>
<Directory Id='TARGETDIR' Name='SourceDir'>
<Directory Id='$(var.PFolder)' Name='PFiles'>
<Directory Id='INSTALLDIR' Name='Mercurial'>
<Component Id='MainExecutable' Guid='$(var.ComponentMainExecutableGUID)' Win64='$(var.IsX64)'>
<CreateFolder />
<Environment Id="Environment" Name="PATH" Part="last" System="yes"
Permanent="no" Value="[INSTALLDIR]" Action="set" />
</Component>
</Directory>
</Directory>
<Directory Id="ProgramMenuFolder" Name="Programs">
<Directory Id="ProgramMenuDir" Name="Mercurial $(var.Version)">
<Component Id="ProgramMenuDir" Guid="$(var.ProgramMenuDir.guid)" Win64='$(var.IsX64)'>
<RemoveFolder Id='ProgramMenuDir' On='uninstall' />
<RegistryValue Root='HKCU' Key='Software\Mercurial\InstallDir' Type='string'
Value='[INSTALLDIR]' KeyPath='yes' />
<Shortcut Id='UrlShortcut' Directory='ProgramMenuDir' Name='Mercurial Web Site'
Target='[ARPHELPLINK]' Icon="hgIcon.ico" IconIndex='0' />
</Component>
</Directory>
</Directory>
<?if $(var.Platform) = "x86" ?>
<Merge Id='VCRuntime' DiskId='1' Language='1033'
SourceFile='$(var.VCRedistSrcDir)\microsoft.vcxx.crt.x86_msm.msm' />
<Merge Id='VCRuntimePolicy' DiskId='1' Language='1033'
SourceFile='$(var.VCRedistSrcDir)\policy.x.xx.microsoft.vcxx.crt.x86_msm.msm' />
<?else?>
<Merge Id='VCRuntime' DiskId='1' Language='1033'
SourceFile='$(var.VCRedistSrcDir)\microsoft.vcxx.crt.x64_msm.msm' />
<Merge Id='VCRuntimePolicy' DiskId='1' Language='1033'
SourceFile='$(var.VCRedistSrcDir)\policy.x.xx.microsoft.vcxx.crt.x64_msm.msm' />
<?endif?>
</Directory>
<Feature Id='Complete' Title='Mercurial' Description='The complete package'
Display='expand' Level='1' ConfigurableDirectory='INSTALLDIR' >
<Feature Id='MainProgram' Title='Program' Description='Mercurial command line app'
Level='1' Absent='disallow' >
<ComponentRef Id='MainExecutable' />
<ComponentRef Id='ProgramMenuDir' />
<ComponentGroupRef Id="hg.group.ROOT" />
<ComponentGroupRef Id="hg.group.defaultrc" />
<ComponentGroupRef Id="hg.group.helptext" />
<ComponentGroupRef Id="hg.group.lib" />
<ComponentGroupRef Id="hg.group.templates" />
<MergeRef Id='VCRuntime' />
<MergeRef Id='VCRuntimePolicy' />
</Feature>
<?ifdef MercurialExtraFeatures?>
<?foreach EXTRAFEAT in $(var.MercurialExtraFeatures)?>
<FeatureRef Id="$(var.EXTRAFEAT)" />
<?endforeach?>
<?endif?>
<Feature Id='Locales' Title='Translations' Description='Translations' Level='1'>
<ComponentGroupRef Id="hg.group.locale" />
</Feature>
<Feature Id='Documentation' Title='Documentation' Description='HTML man pages' Level='1'>
<ComponentGroupRef Id="hg.group.doc" />
</Feature>
<Feature Id='Misc' Title='Miscellaneous' Description='Contributed scripts' Level='1'>
<ComponentGroupRef Id="hg.group.contrib" />
</Feature>
</Feature>
<UIRef Id="WixUI_FeatureTree" />
<UIRef Id="WixUI_ErrorProgressText" />
<WixVariable Id="WixUILicenseRtf" Value="contrib\packaging\wix\COPYING.rtf" />
<Icon Id="hgIcon.ico" SourceFile="contrib/win32/mercurial.ico" />
<Upgrade Id='$(var.ProductUpgradeCode)'>
<UpgradeVersion
IncludeMinimum='yes' Minimum='0.0.0' IncludeMaximum='no' OnlyDetect='no'
Property='INSTALLEDMERCURIALPRODUCTS' />
</Upgrade>
<InstallExecuteSequence>
<RemoveExistingProducts After='InstallInitialize'/>
</InstallExecuteSequence>
</Product>
</Wix>