return false
	}

	// File is already gofmt-ed, so we know that if there are +build lines,
	// they are in a comment group that starts with a //go:build line followed
	// by a blank line. While we cannot delete comments from an AST and
	// expect consistent output in general, this specific case - deleting only
	// some lines from a comment block - does format correctly.
	fixed := false
	for _, g := range f.Comments {

	// Regions overlap or abut - compute the union.
	return shadowRange(min(lo, sr.lo()) + max(hi, sr.hi())<<16)
}

// elimDeadAutosGeneric deletes autos that are never accessed. To achieve this
// we track the operations that the address of each auto reaches and if it only
// reaches stores then we delete all the stores. The other operations will then
// be eliminated by the dead code elimination pass.
func elimDeadAutosGeneric(f *Func) {

	{"copy", `var dst []byte; copy(dst, "hello")`, `func([]byte, string) int`},

	{"delete", `var m map[string]bool; delete(m, "foo")`, `func(map[string]bool, string)`},
	{"delete", `type (K string; V int); var m map[K]V; delete(m, "foo")`, `func(map[p.K]p.V, p.K)`},

	{"imag", `_ = imag(1i)`, `invalid type`}, // constant

			explicitArgs = append(explicitArgs, fmt.Sprintf("-test.%s=%v", short, f.Value))

			// This flag has been overridden explicitly, so don't forward its implicit
			// value from GOFLAGS.
			delete(addFromGOFLAGS, short)
			delete(addFromGOFLAGS, "test."+short)
		}

		args = remainingArgs
	}
	if firstUnknownFlag != "" && testC {
		fmt.Fprintf(os.Stderr, "go: unknown flag %s cannot be used with -c\n", firstUnknownFlag)

			fname := m[1]
			delete(notInlinedReason, curPkg+"."+fname)
			continue
		}
		if m := canInline.FindStringSubmatch(line); m != nil {
			fname := m[1]
			fullname := curPkg + "." + fname
			// If function must be inlined somewhere, being inlinable is not enough
			if _, ok := must[fullname]; !ok {
				delete(notInlinedReason, fullname)
				continue
			}
		}

// README as a courtesy to explain where it came from.
const cacheREADME = `This directory holds cached build artifacts from the Go build system.
Run "go clean -cache" if the directory is getting too large.
Run "go clean -fuzzcache" to delete the fuzz cache.
See golang.org to learn more about Go.
`

// initDefaultCache does the work of finding the default cache
// the first time Default is called.
func initDefaultCache() {
	dir, _ := DefaultDir()

			fname := m[1]
			delete(notInlinedReason, curPkg+"."+fname)
			continue
		}
		if m := canInline.FindStringSubmatch(line); m != nil {
			fname := m[1]
			fullname := curPkg + "." + fname
			// If function must be inlined somewhere, being inlinable is not enough
			if _, ok := must[fullname]; !ok {
				delete(notInlinedReason, fullname)
				continue
			}
		}

// optimization decisions (e.g. "should I inline this call", or
// "should I unroll this loop") as opposed to potentially unsafe IR
// alterations that could change program semantics (e.g. "can I delete
// this variable" or "can I move this statement to a new location").
//
//----------------------------------------------------------------

// FuncProps describes a set of function or method properties that may

				for s := range n.succ {
					// ignore self-cycles
					if s != n {
						p.succ.add(s)
						s.pred.add(p)
					}
				}
				delete(p.succ, n) // remove edge to n
			}
		}
		for s := range n.succ {
			delete(s.pred, n) // remove edge to n
		}
	}

	// fill in index and ndeps fields
	for i, n := range G {
		n.index = i
		n.ndeps = len(n.succ)
	}

	for key, val := range add {
		if p, ok := prev[key]; ok {
			lines[p] = key + "=" + val + "\n"
			delete(add, key)
		}
	}
	for key, val := range add {
		lines = append(lines, key+"="+val+"\n")
	}

	// Delete requested variables (go env -u).
	for key := range del {
		if p, ok := prev[key]; ok {
			lines[p] = ""
		}
	}