Give sum a seed capability
Split adjoin in two templates
Improve return value construction in adjoin
Merge pull request #2013 from monarchdodra/adjoinBuild

improve adjoin
add std.internal.scopebuffer
Merge pull request #1911 from WalterBright/scopebuffer

add std.internal.scopebuffer
Fix T[] const-ness issue in put
Merge pull request #2016 from monarchdodra/ScopeBufferConst

Fix T[] const-ness issue in put
Eliminate _assertPred
Tweak Zip implementation
Merge pull request #2019 from monarchdodra/ZipVararg

Tweak Zip implementation
Issue 3882: Use cast(void) instead of value capture
std.digest: Publicly import LetterCase
Merge pull request #2021 from nordlow/warn-unused-returns

Issue 3882: Use cast(void) instead of value capture
Make std.utf.toUTFz safe and pure
Merge pull request #2023 from tom-tan/safe-pure-std-utf-toUTFz

Make std.utf.toUTFz safe and pure
Mark std.stdio.fopen and popen as trusted
Merge pull request #2022 from CyberShadow/std-digest-public-import

std.digest: Publicly import LetterCase
Merge pull request #2026 from tom-tan/trusted-std-stdio-fopen

Mark std.stdio.fopen and popen as trusted
Mark std.stdio.File.this, opAssign, open and popen as safe