t.Errorf("Expect equality of %s and %s be to %v", tc.ipnet1.String(), tc.ipnet2.String(), tc.expect)
		}
	}
}

func TestIsConnectionRefused(t *testing.T) {
	testCases := []struct {
		err    error
		expect bool
	}{
		{
			&url.Error{Err: &net.OpError{Err: syscall.ECONNRESET}},
			false,
		},
		{
			&url.Error{Err: &net.OpError{Err: syscall.ECONNREFUSED}},
			true,
		},

}
```

以下のようなテキスト版を取得します:

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

#### `RequestValidationError`と`ValidationError`

!!! warning "注意"
    これらは今のあなたにとって重要でない場合は省略しても良い技術的な詳細です。

`RequestValidationError`はPydanticの<a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>のサブクラスです。

				// we just got an error on the primary path, so start
				// the fallback immediately (in 0 nanoseconds).
				fallbackTimer.Reset(0)
			}
		}
	}
}

// dialSerial connects to a list of addresses in sequence, returning
// either the first successful connection, or the first error.
func (sd *sysDialer) dialSerial(ctx context.Context, ras addrList) (Conn, error) {

# Checks that source debug information is used in the output error message.
# CHECK: error: 'tf.Add' op operands don't have broadcast-compatible shapes
# CHECK: math_ops.add(x, y, name='x_y_sum')
# CHECK: build_graph(out_dir)
node: {
  name: "x"
  op: "Placeholder"
  attr: {
    key: "shape"

# info. It should be an error if VCS stamps are requested explicitly with
# '-buildvcs' (since we know the VCS metadata exists), but not an error
# with '-buildvcs=auto'.

go build -o sub.exe ./sub
go version -m sub.exe
! stdout '^\tbuild\tvcs'

! go build -buildvcs -o sub.exe ./sub

package net

import (
	"errors"
	"os"
	"syscall"
)

var (
	errOpNotSupported = syscall.EOPNOTSUPP

	abortedConnRequestErrors = []error{syscall.ECONNABORTED} // see accept in fd_unix.go
)

func isPlatformError(err error) bool {
	_, ok := err.(syscall.Errno)
	return ok
}

func samePlatformError(err, want error) bool {
	if op, ok := err.(*OpError); ok {
		err = op.Err
	}

// error returned when temporary account is not found
var errNoSuchTempAccount = errors.New("Specified temporary account does not exist")

// error returned in IAM subsystem when an account doesn't exist.
var errNoSuchAccount = errors.New("Specified account does not exist")

// error returned in IAM subsystem when groups doesn't exist.

}
```

👆 🔜 🤚 ✍ ⏬, ⏮️:

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

#### `RequestValidationError` 🆚 `ValidationError`

!!! warning
    👫 📡 ℹ 👈 👆 💪 🚶 🚥 ⚫️ 🚫 ⚠ 👆 🔜.

`RequestValidationError` 🎧-🎓 Pydantic <a href="https://docs.pydantic.dev/latest/concepts/models/#error-handling" class="external-link" target="_blank">`ValidationError`</a>.

**FastAPI** uses it so that, if you use a Pydantic model in `response_model`, and your data has an error, you will see the error in your log.

But the client/user will not see it. Instead, the client will receive an "Internal Server Error" with a HTTP status code `500`.

// 
PACKAGE error2

IMPORTPATH
	testdata/error2

FILENAMES
	testdata/error2.go

TYPES
	// 
	type I0 interface {
		// contains filtered or unexported methods
	}

	// 
	type S0 struct {
		// contains filtered or unexported fields
	}

	// 
	type T0 struct {
		ExportedField interface {
			// contains filtered or unexported methods
		}