mirror of
https://github.com/golang/go
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972df38445
Make panics more useful by printing values, if their
underlying kind is printable, instead of just their memory address.
Thus now given any custom type derived from any of:
float*, int*, string, uint*
if we have panic with such a result, its value will be printed.
Thus given any of:
type MyComplex128 complex128
type MyFloat64 float64
type MyString string
type MyUintptr uintptr
panic(MyComplex128(32.1 + 10i))
panic(MyFloat64(-93.7))
panic(MyString("This one"))
panic(MyUintptr(93))
They will now print in the panic:
panic: main.MyComplex64(+1.100000e-001+3.000000e+000i)
panic: main.MyFloat64(-9.370000e+001)
panic: main.MyString("This one")
panic: main.MyUintptr(93)
instead of:
panic: (main.MyComplex128) (0xe0100,0x138cc0)
panic: (main.MyFloat64) (0xe0100,0x138068)
panic: (main.MyString) (0x48aa00,0x4c0840)
panic: (main.MyUintptr) (0xe0100,0x137e58)
and anything else will be printed as in the past with:
panic: (main.MyStruct) (0xe4ee0,0x40a0e0)
Also while here, updated the Go1.15 release notes.
Fixes #37531
Change-Id: Ia486424344a386014f2869ab3483e42a9ef48ac4
Reviewed-on: https://go-review.googlesource.com/c/go/+/221779
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
130 lines
3.3 KiB
HTML
130 lines
3.3 KiB
HTML
<!--{
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"Title": "Go 1.15 Release Notes",
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"Path": "/doc/go1.15"
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}-->
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<!--
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NOTE: In this document and others in this directory, the convention is to
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set fixed-width phrases with non-fixed-width spaces, as in
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<code>hello</code> <code>world</code>.
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Do not send CLs removing the interior tags from such phrases.
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-->
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<style>
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main ul li { margin: 0.5em 0; }
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</style>
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<h2 id="introduction">DRAFT RELEASE NOTES — Introduction to Go 1.15</h2>
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<p>
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<strong>
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Go 1.15 is not yet released. These are work-in-progress
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release notes. Go 1.15 is expected to be released in August 2020.
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</strong>
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</p>
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<h2 id="language">Changes to the language</h2>
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<p>
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TODO
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</p>
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<h2 id="ports">Ports</h2>
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<p>
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TODO
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</p>
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<h2 id="tools">Tools</h2>
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<p>
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TODO
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</p>
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<h3 id="go-command">Go command</h3>
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<p>
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TODO
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</p>
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<h4 id="go-flag-parsing">Flag parsing</h4>
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<p><!-- https://golang.org/cl/211358 -->
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Various flag parsing issues in <code>go</code> <code>test</code> and
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<code>go</code> <code>vet</code> have been fixed. Notably, flags specified
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in <code>GOFLAGS</code> are handled more consistently, and
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the <code>-outputdir</code> flag now interprets relative paths relative to the
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working directory of the <code>go</code> command (rather than the working
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directory of each individual test).
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</p>
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<h2 id="runtime">Runtime</h2>
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<p>
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TODO
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</p>
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<h2 id="library">Core library</h2>
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<p>
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TODO
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</p>
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<dl id="testing"><dt><a href="/pkg/testing/">testing</a></dt>
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<dd>
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<p><!-- golang.org/issue/28135 -->
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The <code>testing.T</code> type now has a <code>Deadline</code> method
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that reports the time at which the test binary will have exceeded its
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timeout.
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</p>
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</dl><!-- testing -->
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<h3 id="minor_library_changes">Minor changes to the library</h3>
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<p>
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As always, there are various minor changes and updates to the library,
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made with the Go 1 <a href="/doc/go1compat">promise of compatibility</a>
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in mind.
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</p>
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<p>
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TODO
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</p>
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<dl id="pkg-runtime"><dt><a href="/pkg/runtime/">runtime</a></dt>
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<dd>
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<p><!-- CL 221779 -->
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If <code>panic</code> is invoked with a value whose type is derived from any
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of: <code>bool</code>, <code>complex64</code>, <code>complex128</code>, <code>float32</code>, <code>float64</code>,
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<code>int</code>, <code>int8</code>, <code>int16</code>, <code>int32</code>, <code>int64</code>, <code>string</code>,
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<code>uint</code>, <code>uint8</code>, <code>uint16</code>, <code>uint32</code>, <code>uint64</code>, <code>uintptr</code>,
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then the value will be printed, instead of just its address.
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</p>
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</dd>
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</dl>
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<dl id="sync"><dt><a href="/pkg/sync/">sync</a></dt>
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<dd>
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<p><!-- golang.org/issue/33762 -->
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The new method
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<a href="/pkg/sync#Map.LoadAndDelete"><code>Map.LoadAndDelete</code></a>
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atomically deletes a key and returns the previous value if present.
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</p>
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<p><!-- CL 205899 -->
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The method
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<a href="/pkg/sync#Map.Delete"><code>Map.Delete</code></a>
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is more efficient.
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</p>
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</dl><!-- sync -->
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<dl id="time"><dt><a href="/pkg/time/">time</a></dt>
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<dd>
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<p><!-- golang.org/issue/33184 -->
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The new method
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<a href="/pkg/time#Ticker.Reset"><code>Ticker.Reset</code></a>
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supports changing the duration of a ticker.
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</p>
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</dd>
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</dl><!-- time -->
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