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// // Copyright 2011 The Go Authors. All rights reserved.
// // Use of this source code is governed by a BSD-style
// // license that can be found in the LICENSE file.
// /*
// Package builtin provides documentation for Go's predeclared identifiers.
// The items documented here are not actually in package builtin
// but their descriptions here allow godoc to present documentation
// for the language's special identifiers.
// */
// package builtin
// import "cmp"
// // bool is the set of boolean values, true and false.
// type bool bool
// // true and false are the two untyped boolean values.
// const (
// true = 0 == 0 // Untyped bool.
// false = 0 != 0 // Untyped bool.
// )
// // uint8 is the set of all unsigned 8-bit integers.
// // Range: 0 through 255.
// type uint8 uint8
// // u16 is the set of all unsigned 16-bit integers.
// // Range: 0 through 65535.
// type u16 u16
// // uint32 is the set of all unsigned 32-bit integers.
// // Range: 0 through 4294967295.
// type uint32 uint32
// // uint64 is the set of all unsigned 64-bit integers.
// // Range: 0 through 18446744073709551615.
// type uint64 uint64
// // int8 is the set of all signed 8-bit integers.
// // Range: -128 through 127.
// type int8 int8
// // int16 is the set of all signed 16-bit integers.
// // Range: -32768 through 32767.
// type int16 int16
// // int32 is the set of all signed 32-bit integers.
// // Range: -2147483648 through 2147483647.
// type int32 int32
// // int64 is the set of all signed 64-bit integers.
// // Range: -9223372036854775808 through 9223372036854775807.
// type int64 int64
// // float32 is the set of all IEEE-754 32-bit floating-point numbers.
// type float32 float32
// // float64 is the set of all IEEE-754 64-bit floating-point numbers.
// type float64 float64
// // complex64 is the set of all complex numbers with float32 real and
// // imaginary parts.
// type complex64 complex64
// // complex128 is the set of all complex numbers with float64 real and
// // imaginary parts.
// type complex128 complex128
// // string is the set of all strings of 8-bit bytes, conventionally but not
// // necessarily representing UTF-8-encoded text. A string may be empty, but
// // not nil. Values of string type are immutable.
// type string string
// // int is a signed integer type that is at least 32 bits in size. It is a
// // distinct type, however, and not an alias for, say, int32.
// type int int
// // uint is an unsigned integer type that is at least 32 bits in size. It is a
// // distinct type, however, and not an alias for, say, uint32.
// type uint uint
// // uintptr is an integer type that is large enough to hold the bit pattern of
// // any pointer.
// type uintptr uintptr
// // byte is an alias for uint8 and is equivalent to uint8 in all ways. It is
// // used, by convention, to distinguish byte values from 8-bit unsigned
// // integer values.
// type byte = uint8
// // rune is an alias for int32 and is equivalent to int32 in all ways. It is
// // used, by convention, to distinguish character values from integer values.
// type rune = int32
// // any is an alias for interface{} and is equivalent to interface{} in all ways.
// type any = interface{}
// // comparable is an interface that is implemented by all comparable types
// // (booleans, numbers, strings, pointers, channels, arrays of comparable types,
// // structs whose fields are all comparable types).
// // The comparable interface may only be used as a type parameter constraint,
// // not as the type of a variable.
// type comparable interface{ comparable }
// // iota is a predeclared identifier representing the untyped integer ordinal
// // number of the current const specification in a (usually parenthesized)
// // const declaration. It is zero-indexed.
// const iota = 0 // Untyped int.
// // nil is a predeclared identifier representing the zero value for a
// // pointer, channel, func, interface, map, or slice type.
// var nil Type // Type must be a pointer, channel, func, interface, map, or slice type
// // Type is here for the purposes of documentation only. It is a stand-in
// // for any Go type, but represents the same type for any given function
// // invocation.
// type Type int
// // Type1 is here for the purposes of documentation only. It is a stand-in
// // for any Go type, but represents the same type for any given function
// // invocation.
// type Type1 int
// // IntegerType is here for the purposes of documentation only. It is a stand-in
// // for any integer type: int, uint, int8 etc.
// type IntegerType int
// // FloatType is here for the purposes of documentation only. It is a stand-in
// // for either float type: float32 or float64.
// type FloatType float32
// // ComplexType is here for the purposes of documentation only. It is a
// // stand-in for either complex type: complex64 or complex128.
// type ComplexType complex64
// // The append built-in function appends elements to the end of a slice. If
// // it has sufficient capacity, the destination is resliced to accommodate the
// // new elements. If it does not, a new underlying array will be allocated.
// // Append returns the updated slice. It is therefore necessary to store the
// // result of append, often in the variable holding the slice itself:
// //
// // slice = append(slice, elem1, elem2)
// // slice = append(slice, anotherSlice...)
// //
// // As a special case, it is legal to append a string to a byte slice, like this:
// //
// // slice = append([u8]("hello "), "world"...)
// func append(slice []Type, elems ...Type) []Type
// // The copy built-in function copies elements from a source slice into a
// // destination slice. (As a special case, it also will copy bytes from a
// // string to a slice of bytes.) The source and destination may overlap. Copy
// // returns the number of elements copied, which will be the minimum of
// // src.len() and dst.len().
// func copy(dst, src []Type) int
// // The delete built-in function deletes the element with the specified key
// // (m[key]) from the map. If m is nil or there is no such element, delete
// // is a no-op.
// func delete(m map[Type]Type1, key Type)
// // The len built-in function returns the length of v, according to its type:
// //
// // Array: the number of elements in v.
// // Pointer to array: the number of elements in *v (even if v is nil).
// // Slice, or map: the number of elements in v; if v is nil, len(v) is zero.
// // String: the number of bytes in v.
// // Channel: the number of elements queued (unread) in the channel buffer;
// // if v is nil, len(v) is zero.
// //
// // For some arguments, such as a string literal or a simple array expression, the
// // result can be a constant. See the Go language specification's "Length and
// // capacity" section for details.
// func len(v Type) int
// // The cap built-in function returns the capacity of v, according to its type:
// //
// // Array: the number of elements in v (same as len(v)).
// // Pointer to array: the number of elements in *v (same as len(v)).
// // Slice: the maximum length the slice can reach when resliced;
// // if v is nil, cap(v) is zero.
// // Channel: the channel buffer capacity, in units of elements;
// // if v is nil, cap(v) is zero.
// //
// // For some arguments, such as a simple array expression, the result can be a
// // constant. See the Go language specification's "Length and capacity" section for
// // details.
// func cap(v Type) int
// // The make built-in function allocates and initializes an object of type
// // slice, map, or chan (only). Like new, the first argument is a type, not a
// // value. Unlike new, make's return type is the same as the type of its
// // argument, not a pointer to it. The specification of the result depends on
// // the type:
// //
// // Slice: The size specifies the length. The capacity of the slice is
// // equal to its length. A second integer argument may be provided to
// // specify a different capacity; it must be no smaller than the
// // length. For example, make([]int, 0, 10) allocates an underlying array
// // of size 10 and returns a slice of length 0 and capacity 10 that is
// // backed by this underlying array.
// // Map: An empty map is allocated with enough space to hold the
// // specified number of elements. The size may be omitted, in which case
// // a small starting size is allocated.
// // Channel: The channel's buffer is initialized with the specified
// // buffer capacity. If zero, or the size is omitted, the channel is
// // unbuffered.
// func make(t Type, size ...IntegerType) Type
// // The max built-in function returns the largest value of a fixed number of
// // arguments of [cmp.Ordered] types. There must be at least one argument.
// // If T is a floating-point type and any of the arguments are NaNs,
// // max will return NaN.
// func max[T cmp.Ordered](x T, y ...T) T
// // The min built-in function returns the smallest value of a fixed number of
// // arguments of [cmp.Ordered] types. There must be at least one argument.
// // If T is a floating-point type and any of the arguments are NaNs,
// // min will return NaN.
// func min[T cmp.Ordered](x T, y ...T) T
// // The new built-in function allocates memory. The first argument is a type,
// // not a value, and the value returned is a pointer to a newly
// // allocated zero value of that type.
// func new(Type) *Type
// // The complex built-in function constructs a complex value from two
// // floating-point values. The real and imaginary parts must be of the same
// // size, either float32 or float64 (or assignable to them), and the return
// // value will be the corresponding complex type (complex64 for float32,
// // complex128 for float64).
// func complex(r, i FloatType) ComplexType
// // The real built-in function returns the real part of the complex number c.
// // The return value will be floating point type corresponding to the type of c.
// func real(c ComplexType) FloatType
// // The imag built-in function returns the imaginary part of the complex
// // number c. The return value will be floating point type corresponding to
// // the type of c.
// func imag(c ComplexType) FloatType
// // The clear built-in function clears maps and slices.
// // For maps, clear deletes all entries, resulting in an empty map.
// // For slices, clear sets all elements up to the length of the slice
// // to the zero value of the respective element type. If the argument
// // type is a type parameter, the type parameter's type set must
// // contain only map or slice types, and clear performs the operation
// // implied by the type argument.
// func clear[T ~[]Type | ~map[Type]Type1](t T)
// // The close built-in function closes a channel, which must be either
// // bidirectional or send-only. It should be executed only by the sender,
// // never the receiver, and has the effect of shutting down the channel after
// // the last sent value is received. After the last value has been received
// // from a closed channel c, any receive from c will succeed without
// // blocking, returning the zero value for the channel element. The form
// //
// // x, ok := <-c
// //
// // will also set ok to false for a closed and empty channel.
// func close(c chan<- Type)
// // The panic built-in function stops normal execution of the current
// // goroutine. When a function F calls panic, normal execution of F stops
// // immediately. Any functions whose execution was deferred by F are run in
// // the usual way, and then F returns to its caller. To the caller G, the
// // invocation of F then behaves like a call to panic, terminating G's
// // execution and running any deferred functions. This continues until all
// // functions in the executing goroutine have stopped, in reverse order. At
// // that point, the program is terminated with a non-zero exit code. This
// // termination sequence is called panicking and can be controlled by the
// // built-in function recover.
// //
// // Starting in Go 1.21, calling panic with a nil interface value or an
// // untyped nil causes a run-time error (a different panic).
// // The GODEBUG setting panicnil=1 disables the run-time error.
// func panic(v any)
// // The recover built-in function allows a program to manage behavior of a
// // panicking goroutine. Executing a call to recover inside a deferred
// // function (but not any function called by it) stops the panicking sequence
// // by restoring normal execution and retrieves the error value passed to the
// // call of panic. If recover is called outside the deferred function it will
// // not stop a panicking sequence. In this case, or when the goroutine is not
// // panicking, or if the argument supplied to panic was nil, recover returns
// // nil. Thus the return value from recover reports whether the goroutine is
// // panicking.
// func recover() any
// // The print built-in function formats its arguments in an
// // implementation-specific way and writes the result to standard error.
// // Print is useful for bootstrapping and debugging; it is not guaranteed
// // to stay in the language.
// func print(args ...Type)
// // The println built-in function formats its arguments in an
// // implementation-specific way and writes the result to standard error.
// // Spaces are always added between arguments and a newline is appended.
// // Println is useful for bootstrapping and debugging; it is not guaranteed
// // to stay in the language.
// func println(args ...Type)
/// The error built-in interface type is the conventional interface for
/// representing an error condition, with the nil value representing no error.