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doc: describe change to eliminate method expression wrappers from stack traces
Change-Id: I824b42a1c1fdcee8712681ffc6316470761be065 Reviewed-on: https://go-review.googlesource.com/c/159858 Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -232,6 +232,23 @@ for {
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</pre>
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</p>
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<p><!-- CL 153477 -->
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Wrappers generated by the compiler to implement method expressions
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are no longer reported
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by <a href="/pkg/runtime/#CallersFrames"><code>runtime.CallersFrames</code></a>
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and <a href="/pkg/runtime/#Stack"><code>runtime.Stack</code></a>. They
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are also not printed in panic stack traces.
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This change aligns the <code>gc</code> toolchain to match
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the <code>gccgo</code> toolchain, which already elided such wrappers
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from stack traces.
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Clients of these APIs might need to adjust for the missing
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frames. For code that must interoperate between 1.11 and 1.12
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releases, you can replace the method expression <code>x.M</code>
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with the function literal <code>func (...) { x.M(...) } </code>.
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</p>
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<p><!-- CL 144340 -->
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The compiler now accepts a <code>-lang</code> flag to set the Go language
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version to use. For example, <code>-lang=go1.8</code> causes the compiler to
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