}

	p.pos = p.i
	p.i += len(tag)
	p.tok = p.s[p.pos:p.i]
	p.isTag = true
}

// IsPlusBuild reports whether the line of text is a “// +build” constraint.
// It only checks the prefix of the text, not that the expression itself parses.
func IsPlusBuild(line string) bool {
	_, ok := splitPlusBuild(line)
	return ok
}

		return
	}

	if check.goBuild == nil {
		check.goBuild = x
	}
}

func (check *checker) plusBuildLine(pos token.Pos, line string) {
	line = strings.TrimSpace(line)
	if !constraint.IsPlusBuild(line) {
		// Comment with +build but not at beginning.
		// Only report early in file.
		if check.plusBuildOK && !strings.HasPrefix(line, "// want") {
			check.pass.Reportf(pos, "possible malformed +build comment")
		}

				p = p[len(p):]
			}
			line = bytes.TrimSpace(line)
			if !bytes.HasPrefix(line, bSlashSlash) || !bytes.Contains(line, bPlusBuild) {
				continue
			}
			text := string(line)
			if !constraint.IsPlusBuild(text) {
				continue
			}
			if x, err := constraint.Parse(text); err == nil {
				if !eval(x, tags, true) {
					shouldBuild = false
				}
			}
		}
	}

	return shouldBuild
}

				p = p[len(p):]
			}
			line = bytes.TrimSpace(line)
			if !bytes.HasPrefix(line, bSlashSlash) || !bytes.Contains(line, bPlusBuild) {
				continue
			}
			text := string(line)
			if !constraint.IsPlusBuild(text) {
				continue
			}
			plusBuild = append(plusBuild, text)
		}
	}

	return string(goBuildBytes), plusBuild, sawBinaryOnly, nil
}

		p.indent = 0
	}

	// shortcut common case of //-style comments
	if text[1] == '/' {
		if constraint.IsGoBuild(text) {
			p.goBuild = append(p.goBuild, len(p.output))
		} else if constraint.IsPlusBuild(text) {
			p.plusBuild = append(p.plusBuild, len(p.output))
		}
		p.writeString(pos, trimRight(text), true)
		return
	}

	// for /*-style comments, print line by line and let the

	var action string
	for actionSrc := src; action == "" && actionSrc != ""; {
		var line string
		line, actionSrc, _ = strings.Cut(actionSrc, "\n")
		if constraint.IsGoBuild(line) || constraint.IsPlusBuild(line) {
			continue
		}
		action = strings.TrimSpace(strings.TrimPrefix(line, "//"))
	}
	if action == "" {
		t.Fatalf("execution recipe not found in GOROOT/test/%s", t.goFileName())
	}

				p = p[len(p):]
			}
			line = bytes.TrimSpace(line)
			if !bytes.HasPrefix(line, slashSlash) || !bytes.Contains(line, plusBuild) {
				continue
			}
			text := string(line)
			if !constraint.IsPlusBuild(text) {
				continue
			}
			if x, err := constraint.Parse(text); err == nil {
				if !ctxt.eval(x, allTags) {
					shouldBuild = false
				}
			}
		}
	}

		{"(*TagExpr).String", Method, 16},
		{"AndExpr", Type, 16},
		{"AndExpr.X", Field, 16},
		{"AndExpr.Y", Field, 16},
		{"Expr", Type, 16},
		{"GoVersion", Func, 21},
		{"IsGoBuild", Func, 16},
		{"IsPlusBuild", Func, 16},
		{"NotExpr", Type, 16},
		{"NotExpr.X", Field, 16},
		{"OrExpr", Type, 16},
		{"OrExpr.X", Field, 16},
		{"OrExpr.Y", Field, 16},
		{"Parse", Func, 16},
		{"PlusBuildLines", Func, 16},

pkg go/build, type Package struct, XTestEmbedPatterns []string
pkg go/build, type Package struct, XTestEmbedPatternPos map[string][]token.Position
pkg go/build/constraint, func IsGoBuild(string) bool
pkg go/build/constraint, func IsPlusBuild(string) bool
pkg go/build/constraint, func Parse(string) (Expr, error)
pkg go/build/constraint, func PlusBuildLines(Expr) ([]string, error)
pkg go/build/constraint, method (*AndExpr) Eval(func(string) bool) bool