affaan-m/ECC · error

ErrInvalidInput

ErrInvalidInput

Error message

invalid input

What it means

Sentinel error example in the golang-patterns skill documentation: ErrInvalidInput is the idiomatic Go sentinel for rejected request data, compared with errors.Is. Mirrored in the es and ja-JP translations; documentation code, not a runtime throw site.

Source

Thrown at skills/golang-patterns/SKILL.md:132

### Custom Error Types

```go
// Define domain-specific errors
type ValidationError struct {
    Field   string
    Message string
}

func (e *ValidationError) Error() string {
    return fmt.Sprintf("validation failed on %s: %s", e.Field, e.Message)
}

// Sentinel errors for common cases
var (
    ErrNotFound     = errors.New("resource not found")
    ErrUnauthorized = errors.New("unauthorized")
    ErrInvalidInput = errors.New("invalid input")
)
```

### Error Checking with errors.Is and errors.As

```go
func HandleError(err error) {
    // Check for specific error
    if errors.Is(err, sql.ErrNoRows) {
        log.Println("No records found")
        return
    }

    // Check for error type
    var validationErr *ValidationError
    if errors.As(err, &validationErr) {
        log.Printf("Validation error on field %s: %s",
            validationErr.Field, validationErr.Message)

View on GitHub (pinned to 06c5e118c4)

Solutions

1. Validate the input against the expected schema before submission; correct malformed or out-of-range fields.
2. Log the rejected value at the boundary so the caller can see which field failed validation.

When it happens

Trigger: Thrown at skills/golang-patterns/SKILL.md:132 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of affaan-m/ECC@06c5e118c4 (2026-08-18). Data as JSON: /api/errors/b06dd1f242327521. Report an issue: GitHub.