all: fix a number of misuses of the word "an"

After golang.org/cl/210124, I wondered if the same error had gone
unnoticed elsewhere. I quickly spotted another dozen mistakes after
reading through the output of:

	git grep '\<[Aa]n [bcdfgjklmnpqrtvwyz][a-z]'

Many results are false positives for acronyms like "an mtime", since
it's pronounced "an em-time". However, the total amount of output isn't
that large given how simple the grep pattern is.

Change-Id: Iaa2ca69e42f4587a9e3137d6c5ed758887906ca6
Reviewed-on: https://go-review.googlesource.com/c/go/+/210678
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Zach Jones <zachj1@gmail.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

12 files changed, 12 insertions, 12 deletions

diff --git a/doc/articles/go_command.html b/doc/articles/go_command.html
index 9f4e8e0631..5b6fd4d24b 100644
--- a/doc/articles/go_command.html
+++ b/doc/articles/go_command.html
@@ -74,7 +74,7 @@ important, the use of the tool itself.</p>
 <p>The <code>go</code> command requires that code adheres to a few key,
 well-established conventions.</p>
 
-<p>First, the import path is derived in an known way from the URL of the
+<p>First, the import path is derived in a known way from the URL of the
 source code.  For Bitbucket, GitHub, Google Code, and Launchpad, the
 root directory of the repository is identified by the repository's
 main URL, without the <code>http://</code> prefix.  Subdirectories are named by
diff --git a/src/archive/tar/reader.go b/src/archive/tar/reader.go
index 3943718517..4f9135b791 100644
--- a/src/archive/tar/reader.go
+++ b/src/archive/tar/reader.go
@@ -433,7 +433,7 @@ func (tr *Reader) readHeader() (*Header, *block, error) {
 			// files generated by a pre-Go1.8 toolchain. If the generated file
 			// happened to have a prefix field that parses as valid
 			// atime and ctime fields (e.g., when they are valid octal strings),
-			// then it is impossible to distinguish between an valid GNU file
+			// then it is impossible to distinguish between a valid GNU file
 			// and an invalid pre-Go1.8 file.
 			//
 			// See https://golang.org/issues/12594
diff --git a/src/cmd/link/internal/ld/deadcode.go b/src/cmd/link/internal/ld/deadcode.go
index e79207e2b8..6d96ae50d7 100644
--- a/src/cmd/link/internal/ld/deadcode.go
+++ b/src/cmd/link/internal/ld/deadcode.go
@@ -306,7 +306,7 @@ func (d *deadcodepass) init() {
 	}
 
 	for _, name := range names {
-		// Mark symbol as an data/ABI0 symbol.
+		// Mark symbol as a data/ABI0 symbol.
 		d.mark(d.ctxt.Syms.ROLookup(name, 0), nil)
 		// Also mark any Go functions (internal ABI).
 		d.mark(d.ctxt.Syms.ROLookup(name, sym.SymVerABIInternal), nil)
diff --git a/src/cmd/link/internal/ld/deadcode2.go b/src/cmd/link/internal/ld/deadcode2.go
index cb6bb05492..9197c700f5 100644
--- a/src/cmd/link/internal/ld/deadcode2.go
+++ b/src/cmd/link/internal/ld/deadcode2.go
@@ -113,7 +113,7 @@ func (d *deadcodePass2) init() {
 	}
 
 	for _, name := range names {
-		// Mark symbol as an data/ABI0 symbol.
+		// Mark symbol as a data/ABI0 symbol.
 		d.mark(d.ldr.Lookup(name, 0), 0)
 		// Also mark any Go functions (internal ABI).
 		d.mark(d.ldr.Lookup(name, sym.SymVerABIInternal), 0)
diff --git a/src/cmd/pprof/readlineui.go b/src/cmd/pprof/readlineui.go
index 5b9701a0e2..0c9fafdad7 100644
--- a/src/cmd/pprof/readlineui.go
+++ b/src/cmd/pprof/readlineui.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// This file contains an driver.UI implementation
+// This file contains a driver.UI implementation
 // that provides the readline functionality if possible.
 
 // +build darwin dragonfly freebsd linux netbsd openbsd solaris windows
diff --git a/src/crypto/elliptic/p256.go b/src/crypto/elliptic/p256.go
index aa9eeb5061..c23e414156 100644
--- a/src/crypto/elliptic/p256.go
+++ b/src/crypto/elliptic/p256.go
@@ -307,7 +307,7 @@ func p256Diff(out, in, in2 *[p256Limbs]uint32) {
 }
 
 // p256ReduceDegree sets out = tmp/R mod p where tmp contains 64-bit words with
-// the same 29,28,... bit positions as an field element.
+// the same 29,28,... bit positions as a field element.
 //
 // The values in field elements are in Montgomery form: x*R mod p where R =
 // 2**257. Since we just multiplied two Montgomery values together, the result
diff --git a/src/encoding/gob/gobencdec_test.go b/src/encoding/gob/gobencdec_test.go
index 41a06b26c8..6d2c8db42d 100644
--- a/src/encoding/gob/gobencdec_test.go
+++ b/src/encoding/gob/gobencdec_test.go
@@ -707,7 +707,7 @@ func TestGobEncoderExtraIndirect(t *testing.T) {
 
 // Another bug: this caused a crash with the new Go1 Time type.
 // We throw in a gob-encoding array, to test another case of isZero,
-// and a struct containing an nil interface, to test a third.
+// and a struct containing a nil interface, to test a third.
 type isZeroBug struct {
 	T time.Time
 	S string
diff --git a/src/io/io_test.go b/src/io/io_test.go
index 0e4ce61240..ca90403c59 100644
--- a/src/io/io_test.go
+++ b/src/io/io_test.go
@@ -13,7 +13,7 @@ import (
 	"testing"
 )
 
-// An version of bytes.Buffer without ReadFrom and WriteTo
+// A version of bytes.Buffer without ReadFrom and WriteTo
 type Buffer struct {
 	bytes.Buffer
 	ReaderFrom // conflicts with and hides bytes.Buffer's ReaderFrom.
diff --git a/src/io/multi_test.go b/src/io/multi_test.go
index d34794a367..f05d5f74ef 100644
--- a/src/io/multi_test.go
+++ b/src/io/multi_test.go
@@ -286,7 +286,7 @@ func TestMultiReaderSingleByteWithEOF(t *testing.T) {
 	}
 }
 
-// Test that a reader returning (n, EOF) at the end of an MultiReader
+// Test that a reader returning (n, EOF) at the end of a MultiReader
 // chain continues to return EOF on its final read, rather than
 // yielding a (0, EOF).
 func TestMultiReaderFinalEOF(t *testing.T) {
diff --git a/src/reflect/type.go b/src/reflect/type.go
index 3d6fde0ae3..fc31e31eee 100644
--- a/src/reflect/type.go
+++ b/src/reflect/type.go
@@ -646,7 +646,7 @@ func resolveNameOff(ptrInModule unsafe.Pointer, off int32) unsafe.Pointer
 // Implemented in the runtime package.
 func resolveTypeOff(rtype unsafe.Pointer, off int32) unsafe.Pointer
 
-// resolveTextOff resolves an function pointer offset from a base type.
+// resolveTextOff resolves a function pointer offset from a base type.
 // The (*rtype).textOff method is a convenience wrapper for this function.
 // Implemented in the runtime package.
 func resolveTextOff(rtype unsafe.Pointer, off int32) unsafe.Pointer
diff --git a/src/runtime/alg.go b/src/runtime/alg.go
index 56a8212981..d8789b4b5f 100644
--- a/src/runtime/alg.go
+++ b/src/runtime/alg.go
@@ -344,7 +344,7 @@ func initAlgAES() {
 	getRandomData(aeskeysched[:])
 }
 
-// Note: These routines perform the read with an native endianness.
+// Note: These routines perform the read with a native endianness.
 func readUnaligned32(p unsafe.Pointer) uint32 {
 	q := (*[4]byte)(p)
 	if sys.BigEndian {
diff --git a/src/runtime/runtime1.go b/src/runtime/runtime1.go
index 180dd7c7e4..148717f83d 100644
--- a/src/runtime/runtime1.go
+++ b/src/runtime/runtime1.go
@@ -486,7 +486,7 @@ func reflect_resolveTypeOff(rtype unsafe.Pointer, off int32) unsafe.Pointer {
 	return unsafe.Pointer((*_type)(rtype).typeOff(typeOff(off)))
 }
 
-// reflect_resolveTextOff resolves an function pointer offset from a base type.
+// reflect_resolveTextOff resolves a function pointer offset from a base type.
 //go:linkname reflect_resolveTextOff reflect.resolveTextOff
 func reflect_resolveTextOff(rtype unsafe.Pointer, off int32) unsafe.Pointer {
 	return (*_type)(rtype).textOff(textOff(off))