"golang.org/x/mod/sumdb/dirhash"
	modzip "golang.org/x/mod/zip"
)

var downloadCache par.ErrCache[module.Version, string] // version → directory

var ErrToolchain = errors.New("internal error: invalid operation on toolchain module")

// Download downloads the specific module version to the
// local download cache and returns the name of the directory
// corresponding to the root of the module's file tree.

	bb.Grow(16 << 20)
	b.SetBytes(int64(bb.Available()))
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		bb.Reset()
		b := bb.AvailableBuffer()
		b = b[:cap(b)] // use max capacity to simulate a large append operation
		bb.Write(b)    // should be nearly infinitely fast
	}

	-fuzztime t
	    Run enough iterations of the fuzz target during fuzzing to take t,
	    specified as a time.Duration (for example, -fuzztime 1h30s).
		The default is to run forever.
	    The special syntax Nx means to run the fuzz target N times
	    (for example, -fuzztime 1000x).

	-fuzzminimizetime t
	    Run enough iterations of the fuzz target during each minimization

	// the core types, if any, of non-local (unbound) type parameters.
	enableCoreTypeUnification = true

	// If traceInference is set, unification will print a trace of its operation.
	// Interpretation of trace:
	//   x ≡ y    attempt to unify types x and y
	//   p ➞ y    type parameter p is set to type y (p is inferred to be y)

	// needed. A package should set this if it would cause go.mod to be written
	// multiple times (for example, 'go get' calls LoadPackages multiple times) or
	// if it needs some other operation to be successful before go.mod and go.sum
	// can be written (for example, 'go mod download' must download modules before
	// adding sums to go.sum). Packages that set this are responsible for calling
	// WriteGoMod explicitly.

	return f(b, ctx, a)
}

// An Action represents a single action in the action graph.
type Action struct {
	Mode       string        // description of action operation
	Package    *load.Package // the package this action works on
	Deps       []*Action     // actions that must happen before this one
	Actor      Actor         // the action itself (nil = no-op)

		// order to detect inconsistencies that wouldn't be feasible to spot-check),
		// so it wouldn't be useful to log when that occurs (because it happens in
		// normal operation all the time).
		readModGraphDebugOnce.Do(func() {
			for _, f := range strings.Split(os.Getenv("GODEBUG"), ",") {
				switch f {
				case "lazymod=log":
					debug.PrintStack()

package gorm

import (
	"fmt"
	"regexp"
	"strings"

	"gorm.io/gorm/clause"
	"gorm.io/gorm/utils"
)

// Model specify the model you would like to run db operations
//
//	// update all users's name to `hello`
//	db.Model(&User{}).Update("name", "hello")
//	// if user's primary key is non-blank, will use it as condition, then will only update that user's name to `hello`
//	db.Model(&user).Update("name", "hello")

		case 0:
			check.assignVars(lhs, rhs)
			return
		case syntax.Def:
			check.shortVarDecl(s.Pos(), lhs, rhs)
			return
		}

		// assignment operations
		if len(lhs) != 1 || len(rhs) != 1 {
			check.errorf(s, MultiValAssignOp, "assignment operation %s requires single-valued expressions", s.Op)
			return
		}

		var x operand
		check.binary(&x, nil, lhs[0], rhs[0], s.Op)

// opPos returns the position of the operator if x is an operation;
// otherwise it returns the start position of x.
func opPos(x syntax.Expr) syntax.Pos {
	switch op := x.(type) {
	case nil:
		return nopos // don't crash
	case *syntax.Operation:
		return op.Pos()
	default:
		return syntax.StartPos(x)
	}
}

// opName returns the name of the operation if x is an operation