As wrap standard func As from package errors.

E wrap error with right stack trace Use this function to wrap error with stack trace anywhere.

Er wraps an error with a stack trace and adds a message to the error.

Is wrap standard func Is from package errors.

New returns a new error with the given message and stack trace.

Frame represents a program counter inside a stack frame.

StackTrace is stack of Frames from innermost (newest) to outermost (oldest).