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doc: update go1.8.html after feedback from Russ
Address Russ's feedback from https://golang.org/cl/33244 TBR=See https://golang.org/cl/33244 Updates #17929 Change-Id: I708d71f519f6414ecec629d3c273d9e737d8ed50 Reviewed-on: https://go-review.googlesource.com/33656 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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doc/go1.8.html
@ -43,12 +43,12 @@ and <a href="#sort">simplifies sorting slices</a>.
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<p>
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When explicitly converting structs, tags are now ignored for structural type identity.
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See <a href="https://golang.org/cl/24190">change 24190</a> for details.
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See <a href="/ref/spec#Conversions">language specification</a> for details.
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</p>
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<p> <!-- CL 17711 -->
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The language specification now only requires that implementations
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support up to 16-bit exponents in constants. This does not affect
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support up to 16-bit exponents in floating-point constants. This does not affect
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either the <code>gc</code> or <code>gccgo</code> compilers, both of
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which still support 32-bit exponents.
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</p>
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@ -107,17 +107,96 @@ and <code>VMOVSLDUP</code>.</p>
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<p>
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For 64-bit PPC systems, the common vector scalar instructions have been
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added. See <a href="https://golang.org/cl/30510">change 30510</a>.
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added:
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<code>LXS</code>,
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<code>LXSDX</code>,
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<code>LXSI</code>,
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<code>LXSIWAX</code>,
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<code>LXSIWZX</code>,
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<code>LXV</code>,
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<code>LXVD2X</code>,
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<code>LXVDSX</code>,
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<code>LXVW4X</code>,
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<code>MFVSR</code>,
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<code>MFVSRD</code>,
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<code>MFVSRWZ</code>,
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<code>MTVSR</code>,
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<code>MTVSRD</code>,
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<code>MTVSRWA</code>,
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<code>MTVSRWZ</code>,
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<code>STXS</code>,
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<code>STXSDX</code>,
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<code>STXSI</code>,
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<code>STXSIWX</code>,
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<code>STXV</code>,
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<code>STXVD2X</code>,
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<code>STXVW4X</code>,
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<code>XSCV</code>,
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<code>XSCVDPSP</code>,
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<code>XSCVDPSPN</code>,
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<code>XSCVDPSXDS</code>,
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<code>XSCVDPSXWS</code>,
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<code>XSCVDPUXDS</code>,
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<code>XSCVDPUXWS</code>,
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<code>XSCVSPDP</code>,
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<code>XSCVSPDPN</code>,
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<code>XSCVSXDDP</code>,
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<code>XSCVSXDSP</code>,
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<code>XSCVUXDDP</code>,
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<code>XSCVUXDSP</code>,
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<code>XSCVX</code>,
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<code>XSCVXP</code>,
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<code>XVCV</code>,
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<code>XVCVDPSP</code>,
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<code>XVCVDPSXDS</code>,
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<code>XVCVDPSXWS</code>,
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<code>XVCVDPUXDS</code>,
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<code>XVCVDPUXWS</code>,
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<code>XVCVSPDP</code>,
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<code>XVCVSPSXDS</code>,
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<code>XVCVSPSXWS</code>,
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<code>XVCVSPUXDS</code>,
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<code>XVCVSPUXWS</code>,
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<code>XVCVSXDDP</code>,
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<code>XVCVSXDSP</code>,
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<code>XVCVSXWDP</code>,
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<code>XVCVSXWSP</code>,
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<code>XVCVUXDDP</code>,
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<code>XVCVUXDSP</code>,
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<code>XVCVUXWDP</code>,
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<code>XVCVUXWSP</code>,
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<code>XVCVX</code>,
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<code>XVCVXP</code>,
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<code>XXLAND</code>,
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<code>XXLANDC</code>,
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<code>XXLANDQ</code>,
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<code>XXLEQV</code>,
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<code>XXLNAND</code>,
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<code>XXLNOR</code>,
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<code>XXLOR</code>,
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<code>XXLORC</code>,
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<code>XXLORQ</code>,
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<code>XXLXOR</code>,
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<code>XXMRG</code>,
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<code>XXMRGHW</code>,
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<code>XXMRGLW</code>,
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<code>XXPERM</code>,
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<code>XXPERMDI</code>,
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<code>XXSEL</code>,
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<code>XXSI</code>,
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<code>XXSLDWI</code>,
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<code>XXSPLT</code>, and
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<code>XXSPLTW</code>.
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</p>
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<h3 id="tool_yacc">Yacc</h3>
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<p> <!-- CL 27324, CL 27325 -->
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The <code>yacc</code> (previously available via
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The <code>yacc</code> tool (previously available via
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“<code>go</code> <code>tool</code> <code>yacc</code>”)
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has been removed. As of Go 1.7 it was no longer used by the Go compiler.
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It has moved to the “tools” repository and is and is available via
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<code>go get <a href="https://godoc.org/golang.org/x/tools/cmd/goyacc">golang.org/x/tools/cmd/goyacc</a></code>.
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<code>go</code> <code>get</code> <code><a href="https://godoc.org/golang.org/x/tools/cmd/goyacc">golang.org/x/tools/cmd/goyacc</a></code>.
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</p>
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<h3 id="compiler">Compiler Toolchain</h3>
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@ -140,8 +219,8 @@ TODO: ARM binary size & perf numbers.
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</p>
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<p>
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The temporary <code>-ssa=0</code> flag introduced in Go 1.7 to disable
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the new backend has been removed in Go 1.8.
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The temporary <code>-ssa=0</code> compiler flag introduced in Go 1.7
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to disable the new backend has been removed in Go 1.8.
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</p>
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<p>
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@ -180,13 +259,17 @@ is unchanged, but there are a number of changes worth noting.
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</p>
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<p>
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A new “<code>go</code> <code>bug</code>” command helps users file bug reports.
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A new
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“<a href="/cmd/go/#hdr-Print_information_for_bug_reports"><code>go</code>
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<code>bug</code></a>” command helps users file bug reports.
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</p>
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<h3 id="cmd_doc">Go doc</h3>
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<p> <!-- CL 25419 -->
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The “<code>go</code> <code>doc</code>” command
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The
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“<a href="/cmd/go/#hdr-Show_documentation_for_package_or_symbol"><code>go</code>
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<code>doc</code></a>” command
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now groups constants and variables with their type,
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following the behavior of
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<a href="/cmd/godoc/"><code>godoc</code></a>.
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@ -203,14 +286,14 @@ A new “<code>go</code> <code>bug</code>” command helps users file bug report
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explicitly.
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</p>
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<h3 id="plugin">Plug-ins</h3>
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<h3 id="plugin">Plugins</h3>
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<p>
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Go now supports a “<code>plugin</code>” build mode for generating
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plug-ins written in Go, and a
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plugins written in Go, and a
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new <a href="/pkg/plugin/"><code>plugin</code></a> package for
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loading such plug-ins at run time. Plug-ins support is only currently
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available on Linux and Darwin.
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loading such plugins at run time. Plugin support is only currently
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available on Linux and macOS.
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</p>
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<h2 id="runtime">Runtime</h2>
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@ -256,19 +339,22 @@ packages.
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<h3 id="gc">Garbage Collector</h3>
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<p>
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Garbage collection pauses should be significantly shorter than they
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were in Go 1.7, often as low as 10 microseconds and usually under 100
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microseconds.
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See the
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<a href="https://github.com/golang/proposal/blob/master/design/17503-eliminate-rescan.md">
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document on eliminating stop-the-world stack re-scanning</a> for details.
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More work remains for Go 1.9.
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Garbage collection pauses should be significantly shorter than they
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were in Go 1.7, often as low as 10 microseconds and usually under 100
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microseconds.
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See the
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<a href="https://github.com/golang/proposal/blob/master/design/17503-eliminate-rescan.md"
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>document on eliminating stop-the-world stack re-scanning</a>
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for details. More work remains for Go 1.9.
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</p>
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<h3 id="defer">Defer</h3>
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<!-- CL 29656, CL 29656 -->
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<p><code>defer</code> calls are now about twice as fast.</p>
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<p>
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The overhead of <a href="/ref/spec/#Defer_statements">deferred
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function calls</a> has been reduced by half.
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</p>
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<h3 id="cgoperf">Cgo</h3>
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@ -375,7 +461,7 @@ in mind.
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The encoder, when operating in
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<a href="/pkg/compress/flate/#NoCompression"><code>NoCompression</code></a>
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mode, now produces a consistent output that is not dependent on
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the size of the input buffer to the
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the size of the slices passed to the
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<a href="/pkg/compress/flate/#Writer.Write"><code>Write</code></a>
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method.
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</p>
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@ -399,7 +485,7 @@ in mind.
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field is the zero value.
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In previous releases of Go, the <code>Writer</code> would encode
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a non-sensible value.
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a nonsensical value.
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Similarly,
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the <a href="/pkg/compress/gzip/#Reader"><code>Reader</code></a>
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@ -502,7 +588,10 @@ pkg debug/pe, type StringTable []uint8</pre>
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<dl id="encoding_base64"><dt><a href="/pkg/encoding/base64/">encoding/base64</a></dt>
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<dd>
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<p> <!-- CL 24964 -->
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The new <a href="/pkg/encoding/base64/#Encoding.Strict"><code>Encoding.Strict</code></a> method returns an <code>Encoding</code> that causes the decoder to return an error when the trailing padding bits are not zero.
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The new
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<a href="/pkg/encoding/base64/#Encoding.Strict"><code>Encoding.Strict</code></a>
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method returns an <code>Encoding</code> that causes the decoder
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to return an error when the trailing padding bits are not zero.
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</p>
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</dd>
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</dl>
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@ -536,14 +625,17 @@ pkg debug/pe, type StringTable []uint8</pre>
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</p>
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<p> <!-- CL 30371 -->
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Numbers are now formatted in the same floating point format as they are in ES6.
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Marshal encodes floating-point numbers using the same format as in ES6,
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preferring decimal (not exponential) notation for a wider range of values.
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In particular, all floating-point integers up to 2<sup>64</sup> format the
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same as the equivalent <code>int64</code> representation.
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</p>
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<p> <!-- CL 30944 -->
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Implementations
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of <a href="/pkg/encoding/json/#Unmarshaler"><code>Unmarshaler</code></a>
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are now called with the literal "<code>null</code>" and can
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decide what to do with it.
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decide how to handle it.
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</p>
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</dd>
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@ -593,10 +685,14 @@ pkg debug/pe, type StringTable []uint8</pre>
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<dl id="math_rand"><dt><a href="/pkg/math/rand/">math/rand</a></dt>
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<dd>
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<p>
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There is a new
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method <a href="/pkg/math/rand/#Rand.Uint64"><code>Rand.Uint64</code></a>
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to return <code>uint64</code> values. <!-- CL 27253 -->
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<p><!-- CL 27253, CL 33456 -->
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The new <a href="/pkg/math/rand/#Rand.Uint64"><code>Rand.Uint64</code></a>
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method returns <code>uint64</code> values. The
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new <a href="/pkg/math/rand/#Rand.Source64"><code>Rand.Source64</code></a>
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interface describes sources capable of generating such values
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directly; otherwise the <code>Rand.Uint64</code> method
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constructs a <code>uint64</code> from two calls
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to <code>Rand.Source</code>'s <code>Int63</code> method.
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</p>
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</dd>
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@ -628,11 +724,10 @@ pkg debug/pe, type StringTable []uint8</pre>
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<li>The server now supports graceful shutdown support, <a href="#http_shutdown">mentioned above</a>.</li>
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<li> <!-- CL 32024 -->
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The <a href="/pkg/net/http/#Server"><code>Server</code></a> now
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has new configuration options
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<code>ReadHeaderTimeout</code> and <code>IdleTimeout</code>.
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The previously ill-defined <code>WriteTimeout</code> is now
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documented.
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The <a href="/pkg/net/http/#Server"><code>Server</code></a>
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adds configuration options
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<code>ReadHeaderTimeout</code> and <code>IdleTimeout</code>
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and documents <code>WriteTimeout</code>.
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</li>
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<li> <!-- CL 32014 -->
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@ -666,26 +761,28 @@ pkg debug/pe, type StringTable []uint8</pre>
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support.
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</li>
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|
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<li><!-- CL 32479 --> There is now a second way to serve trailers
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for when the trailer name is not known before the headers are
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written (via a call to
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to <code>ResponseWriter.WriteHeader</code>). The old way
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continues to work, but when the trailer is only known after the
|
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header has been written, see the
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new <a href="/pkg/net/http/#TrailerPrefix"><code>TrailerPrefix</code></a>.</li>
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<li><!-- CL 32479 -->
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To serve trailers known after the header has been written,
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see the new
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<a href="/pkg/net/http/#TrailerPrefix"><code>TrailerPrefix</code></a>
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mechanism.
|
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</li>
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|
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<li><!-- CL 33099 -->
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A <code>Handler</code> now has a supported mechanism to abort a
|
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response: panicking with
|
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A <code>Handler</code> can now abort a response by panicking
|
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with the error
|
||||
<a href="/pkg/net/http/#ErrAbortHandler"><code>ErrAbortHandler</code></a>.
|
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</li>
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<li><!-- CL 30812 -->
|
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There is now a supported mechanism to test whether a
|
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<code>ResponseWriter</code> has been hijacked: <code>Write</code> zero bytes to it.
|
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While this previously returned
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<a href="/pkg/net/http/#ErrHijacked"><code>ErrHijacked</code></a>, now
|
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it also does so without spamming the server's error log.
|
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A <code>Write</code> of zero bytes to a
|
||||
<a href="/pkg/net/http/#ResponseWriter"><code>ResponseWriter</code></a>
|
||||
is now defined as a
|
||||
way to test whether a <code>ResponseWriter</code> has been hijacked:
|
||||
if so, the <code>Write</code> returns
|
||||
<a href="/pkg/net/http/#ErrHijacked"><code>ErrHijacked</code></a>
|
||||
without printing an error
|
||||
to the server's error log.
|
||||
</li>
|
||||
|
||||
</ul>
|
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@ -693,16 +790,23 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p>Client & Transport changes:</p>
|
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<ul>
|
||||
<li><!-- CL 28930 -->
|
||||
The <code>Client</code> now copies request headers on redirect.
|
||||
The <a href="/pkg/net/http/#Client"><code>Client</code></a>
|
||||
now copies most request headers on redirect. Authentication-specific
|
||||
headers are only sent to the same origin or subdomains thereof.
|
||||
Cookies are not sent again, unless they were set explicitly.
|
||||
TODO: verify this, and link to docs once https://github.com/golang/go/issues/18096
|
||||
is fixed.
|
||||
</li>
|
||||
|
||||
<li><!-- CL 29072 -->
|
||||
The <code>Transport</code> now supports international domain names.
|
||||
The <a href="/pkg/net/http/#Transport"><code>Transport</code></a>
|
||||
now supports international domain names. Consequently, so do
|
||||
<a href="/pkg/net/http/#Get">Get</a> and other helpers.
|
||||
</li>
|
||||
|
||||
<li><!-- CL 31733, CL 29852 -->
|
||||
The <code>Client</code> now supports 307 and 308 redirects.
|
||||
If the redirect involves re-sending the request body,
|
||||
If the redirect requires resending the request body,
|
||||
the request must have the new
|
||||
<a href="/pkg/net/http/#Request"><code>Request.GetBody</code></a>
|
||||
field defined.
|
||||
@ -730,7 +834,7 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
|
||||
<li> <!-- CL 28077 -->
|
||||
The <a href="/pkg/net/http/#DefaultTransport"><code>DefaultTransport.Dialer</code></a>
|
||||
now enables <code>DualStack</code> ("Happy Eyeballs") support,
|
||||
now enables <code>DualStack</code> ("<a href="https://tools.ietf.org/html/rfc6555">Happy Eyeballs</a>") support,
|
||||
to use IPv4 as a backup if it looks like IPv6 might be
|
||||
failing.
|
||||
</li>
|
||||
@ -743,14 +847,22 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<dd>
|
||||
|
||||
<p> <!-- CL 32176 -->
|
||||
Empty quoted strings are now allowed in the name part of an
|
||||
address. That is, this is now a legal address:
|
||||
<code>"" <gopher@example.com></code>
|
||||
Empty quoted strings are once again allowed in the name part of
|
||||
an address. That is, Go 1.4 and earlier accepted
|
||||
<code>"" <gopher@example.com></code>,
|
||||
but Go 1.5 introduced a bug that rejected this address.
|
||||
The address is recognized again.
|
||||
</p>
|
||||
|
||||
<p> <!-- CL 31581 -->
|
||||
The <a href="/pkg/net/mail/#ParseDate"><code>ParseDate</code></a>
|
||||
function has been exported.
|
||||
The
|
||||
<a href="/pkg/net/mail/#Header.Date"><code>Header.Date</code></a>
|
||||
method has always provided a way to parse
|
||||
the <code>Date:</code> header.
|
||||
A new function
|
||||
<a href="/pkg/net/mail/#ParseDate"><code>ParseDate</code></a>
|
||||
allows parsing dates found in other
|
||||
header lines, such as the <code>Resent-Date:</code> header.
|
||||
</p>
|
||||
|
||||
</dd>
|
||||
@ -760,10 +872,12 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<dd>
|
||||
|
||||
<p> <!-- CL 33143 -->
|
||||
If implementations of the <a href="/pkg/net/smtp/#Auth"><code>Auth</code></a>
|
||||
interface return an empty <code>toServer</code> value, the package
|
||||
no longer sends trailing whitespace after the SMTP <code>AUTH</code>
|
||||
command, which some servers rejected.
|
||||
If an implementation of
|
||||
the <a href="/pkg/net/smtp/#Auth"><code>Auth</code></a>
|
||||
interface's <code>Start</code> method returns an
|
||||
empty <code>toServer</code> value, the package no longer sends
|
||||
trailing whitespace in the SMTP <code>AUTH</code> command,
|
||||
which some servers rejected.
|
||||
</p>
|
||||
|
||||
</dd>
|
||||
@ -777,7 +891,7 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
and
|
||||
<a href="/pkg/net/url/#PathUnescape"><code>PathUnescape</code></a>
|
||||
are similar to the query escaping and unescaping functions but
|
||||
don't treat spaces specially.</p>
|
||||
for path elements.</p>
|
||||
|
||||
<p> <!-- CL 28933 --> The new methods
|
||||
<a href="/pkg/net/url/#URL.Hostname"><code>URL.Hostname</code></a>
|
||||
@ -796,13 +910,18 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p> <!-- CL 31467 -->
|
||||
The <code>URL</code> type now implements
|
||||
<a href="/pkg/encoding/#BinaryMarshaler"><code>encoding.BinaryMarshaler</code></a> and
|
||||
<a href="/pkg/encoding/#BinaryUnmarshaler"><code>encoding.BinaryUnmarshaler</code></a>.
|
||||
<a href="/pkg/encoding/#BinaryUnmarshaler"><code>encoding.BinaryUnmarshaler</code></a>,
|
||||
making it possible to process URLs in <a href="/pkg/encoding/gob/">gob data</a>.
|
||||
</p>
|
||||
|
||||
<p> <!-- CL 29610, CL 31582 -->
|
||||
<code>Parse</code> now rejects relative URLs containing a "<code>:</code>" in
|
||||
the first path segment. Such paths should be prefixed with "<code>./</code>".
|
||||
The <code>URL.String</code> method now prepends "<code>./</code>" to such paths.
|
||||
Following RFC 3986,
|
||||
<a href="/pkg/net/url/#Parse"><code>Parse</code></a>
|
||||
now rejects URLs like <code>this_that:other/thing</code> instead of
|
||||
interpreting them as relative paths (<code>this_that</code> is not a valid scheme).
|
||||
To force interpretation as a relative path,
|
||||
such URLs should be prefixed with <code>"./"</code>.
|
||||
The <code>URL.String</code> method now inserts this prefix as needed.
|
||||
</p>
|
||||
|
||||
</dd>
|
||||
@ -823,9 +942,7 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p> <!-- CL 30088 -->
|
||||
The new function
|
||||
<a href="/pkg/reflect/#Swapper"><code>Swapper</code></a> was
|
||||
added to support
|
||||
the <a href="#sortslice">new <code>sort.Slice</code>
|
||||
support</a>.
|
||||
added to support <a href="#sortslice"><code>sort.Slice</code></a>.
|
||||
</p>
|
||||
</dd>
|
||||
</dl>
|
||||
@ -836,7 +953,8 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p> <!-- CL 31210 -->
|
||||
The <a href="/pkg/strconv/#Unquote"><code>Unquote</code></a>
|
||||
function now strips carriage returns (<code>\r</code>) in
|
||||
backquoted raw strings.
|
||||
backquoted raw strings, following the
|
||||
<a href="/ref/spec#String_literals">Go language semantics</a>.
|
||||
</p>
|
||||
</dd>
|
||||
</dl>
|
||||
@ -849,7 +967,10 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
the analogous <code>Since</code> function.
|
||||
</p>
|
||||
|
||||
<p> <!-- CL 29338 --> <code>ParseDuration</code> now accepts long fractional parts.</p>
|
||||
<p> <!-- CL 29338 -->
|
||||
<a href="/pkg/time/#ParseDuration"><code>ParseDuration</code></a>
|
||||
now accepts long fractional parts.
|
||||
</p>
|
||||
|
||||
<p> <!-- CL 33429 -->
|
||||
<code>Parse</code> now validates days that are too small, in
|
||||
@ -886,12 +1007,14 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p><!-- CL 32483 -->
|
||||
The new function
|
||||
<a href="/pkg/testing/#CoverMode"><code>CoverMode</code></a>
|
||||
reports what the test coverage mode is set to.
|
||||
reports the test coverage mode.
|
||||
</p>
|
||||
|
||||
<p><!-- CL 32615 -->
|
||||
Tests and benchmarks are now marked as failed if the race
|
||||
detector is enabled and a data race occurs during execution.
|
||||
Previously, individual test cases would appear to pass,
|
||||
and only the overall execution of the test binary would fail.
|
||||
</p>
|
||||
|
||||
</dd>
|
||||
@ -902,17 +1025,7 @@ pkg debug/pe, type StringTable []uint8</pre>
|
||||
<p><!-- CL 30935 -->
|
||||
<code>SimpleFold</code> now returns its argument unchanged
|
||||
if the provided input was an invalid rune.
|
||||
</p>
|
||||
</dd>
|
||||
</dl>
|
||||
|
||||
|
||||
|
||||
|
||||
<dl id="foo"><dt><a href="/pkg/foo/">foo</a></dt>
|
||||
<dd>
|
||||
<p> <!-- CL nnn -->
|
||||
|
||||
Previously, the implementation failed with an index bounds check panic.
|
||||
</p>
|
||||
</dd>
|
||||
</dl>
|
||||
|
Loading…
Reference in New Issue
Block a user