}

// isNoSuchPackageVersion reports whether err indicates that the requested
// package does not exist at the requested version, either because no module
// that could contain it exists at that version, or because every such module
// that does exist does not actually contain the package.
func isNoSuchPackageVersion(err error) bool {
	var noPackage *modload.PackageNotInModuleError

						}
					} else {
						// The Go version is at least 1.14, a vendor directory exists, and
						// the modules.txt was generated in the same mode the command is running in.
						// Set -mod=vendor by default.
						cfg.BuildMod = "vendor"
						cfg.BuildModReason = "Go version in " + versionSource + " is at least 1.14 and vendor directory exists."
						return
					}
				}
			} else {

		toolchain = append(toolchain, "cmd/buildid")
	}

	if isdir(pathf("%s/src/pkg", goroot)) {
		fatalf("\n\n"+
			"The Go package sources have moved to $GOROOT/src.\n"+
			"*** %s still exists. ***\n"+
			"It probably contains stale files that may confuse the build.\n"+
			"Please (check what's there and) remove it and try again.\n"+
			"See https://golang.org/s/go14nopkg\n",
			pathf("%s/src/pkg", goroot))

// If the command exits with a non-zero exit status, runGcc prints
// details about what was run and exits.
// Otherwise runGcc returns the data written to standard output and standard error.
// Note that for some of the uses we expect useful data back
// on standard error, but for those uses gcc must still exit 0.
func runGcc(stdin []byte, args []string) (string, string) {

}

// mustExist fails if path does not exist.
func (tg *testgoData) mustExist(path string) {
	tg.t.Helper()
	if _, err := os.Stat(path); err != nil {
		if os.IsNotExist(err) {
			tg.t.Fatalf("%s does not exist but should", path)
		}
		tg.t.Fatalf("%s stat failed: %v", path, err)
	}
}

// mustNotExist fails if path exists.
func (tg *testgoData) mustNotExist(path string) {
	tg.t.Helper()

		{"type ( E1[P any] struct{ f P }; E2[P any] struct{}; x struct{ E1[int]; *E2[int] }); func (E2[P]) f() {}", false, []int{1, 0}, false},

		// outside methodset
		// (*T).f method exists, but value of type T is not addressable
		{"var x T; type T struct{}; func (*T) f() {}", false, nil, true},

		// outside method set of a generic type

			// path because that path could plausibly be provided by some other
			// module.
			//
			// Any other error indicates that the package “exists” (at least in the
			// sense that it cannot exist in any other module), but has some other
			// problem (such as a syntax error).
			return "", err
		}
	}

	for _, mod := range MainModules.Versions() {

		// actually print that if it panics, exits, or terminates abnormally,
		// so we print it here. We can't always check whether it was printed
		// because some tests need stdout to be a terminal (golang.org/issue/34791),
		// not a pipe.
		// TODO(golang.org/issue/29062): tests that exit with status 0 without
		// printing a final result should fail.
		prefix := ""

			// instead.
			return rs, mg, rsErr
		}
		rs = newRS
		mg, mgErr = rs.Graph(ctx)
	}

	return rs, mg, mgErr
}

// EditBuildList edits the global build list by first adding every module in add
// to the existing build list, then adjusting versions (and adding or removing
// requirements as needed) until every module in mustSelect is selected at the

			if window > len(b[i:]) {
				window = len(b[i:])
			}
			// Fill the window with non-match
			for j := 0; j < window; j++ {
				b[i+j] = byte(100)
			}
			// Try to find something that doesn't exist
			p := Count(b[i:i+window], []byte{0})
			if p != 0 {
				t.Errorf("TestCountByteNoMatch(%q, 0) = %d", b[i:i+window], p)
			}
			for j := 0; j < window; j++ {
				b[i+j] = byte(0)
			}
		}
	}
}