code generated for gcc. The build process links this stub, along with
_cgo_export.c and *.cgo2.c, into a dynamic executable and then lets
cgo examine the executable. Cgo records the list of shared library
references and resolved names and writes them into a new file
_cgo_import.go, which looks like:

	//go:cgo_dynamic_linker "/lib64/ld-linux-x86-64.so.2"

			t.Logf("%q (Open error: %v)", dirEntry.Name(), err)
		}
		t.FailNow()
	}
	info, err := dirEntries[0].Info()
	if err != nil {
		t.Fatalf("Error reading info entry: %v", err)
	}
	if name := info.Name(); name != "test.txt" {
		t.Errorf("Inconsistent name in info entry: %v", name)
	}
}

func TestUnderSize(t *testing.T) {
	z, err := OpenReader("testdata/readme.zip")

	check(t, "NewBuffer", &buf, testString)
}

func TestNewBufferString(t *testing.T) {
	buf := NewBufferString(testString)
	check(t, "NewBufferString", buf, testString)
}

// Empty buf through repeated reads into fub.
// The initial contents of buf corresponds to the string s.
func empty(t *testing.T, testname string, buf *Buffer, s string, fub []byte) {
	check(t, testname+" (empty 1)", buf, s)

	for {

carriage returns (U+000D), and newlines (U+000A),
is ignored except as it separates tokens
that would otherwise combine into a single token. Also, a newline or end of file
may trigger the insertion of a <a href="#Semicolons">semicolon</a>.
While breaking the input into tokens,
the next token is the longest sequence of characters that form a
valid token.
</p>

<h3 id="Semicolons">Semicolons</h3>

<p>

Jonathan Amsterdam <******@****.***> 1705947607 -0500

Jonathan Amsterdam <******@****.***> 1705624488 -0500

set -e
if [ ! -f make.bash ]; then
	echo 'all.bash must be run from $GOROOT/src' 1>&2
	exit 1
fi
. ./make.bash "$@" --no-banner
bash run.bash --no-rebuild

	VREV32	V5.B16, V5.B16                  // a508206e
	VREV64	V2.S2, V3.S2                    // 4308a00e
	VREV64	V2.S4, V3.S4                    // 4308a04e

// logical ops
//
// make sure constants get encoded into an instruction when it could
	AND	R1@>33, R2
	AND	$(1<<63), R1                        // AND	$-9223372036854775808, R1       // 21004192
	AND	$(1<<63-1), R1                      // AND	$9223372036854775807, R1        // 21f84092

layout: article
---

<!--
This document is kept in the Go repo, not x/website,
because it documents the full list of known GODEBUG settings,
which are tied to a specific release.
-->

## Introduction {#intro}

Go's emphasis on backwards compatibility is one of its key strengths.
There are, however, times when we cannot maintain complete compatibility.
If code depends on buggy (including insecure) behavior,

	// TODO: These are preprocessed by the assembler into MOVD $const>>shift, R5; SLD $shift, R5.
	//       This only captures the MOVD. Should the SLD be appended to the encoding by the test?
	// Hex constant 0x20004000000
	MOVD $2199090364416, R5         // 60058001
	// Hex constant 0xFFFFFE0004000000
	MOVD $-2198956146688, R5        // 38a08001
	// TODO: On GOPPC64={power8,power9}, this is preprocessed into MOVD $-1, R5; RLDC R5, $33, $63, R5.