check.seenPkgMap = make(map[*Package]bool)
			check.markImports(check.pkg)
		}
		// If the same package name was used by multiple packages, display the full path.
		if len(check.pkgPathMap[pkg.name]) > 1 {
			return strconv.Quote(pkg.path)
		}
		return pkg.name
	}
	return ""
}

// markImports recursively walks pkg and its imports, to record unique import
// paths in pkgPathMap.

			check.seenPkgMap = make(map[*Package]bool)
			check.markImports(check.pkg)
		}
		// If the same package name was used by multiple packages, display the full path.
		if len(check.pkgPathMap[pkg.name]) > 1 {
			return strconv.Quote(pkg.path)
		}
		return pkg.name
	}
	return ""
}

// markImports recursively walks pkg and its imports, to record unique import
// paths in pkgPathMap.

		// Once we've formatted an error message, keep the pkgPathMap
		// up-to-date on subsequent imports. It is used for package
		// qualification in error messages.
		if check.pkgPathMap != nil {
			check.markImports(imp)
		}
		return imp
	}

	// something went wrong (importer may have returned incomplete package without error)
	return nil
}

		// Once we've formatted an error message, keep the pkgPathMap
		// up-to-date on subsequent imports. It is used for package
		// qualification in error messages.
		if check.pkgPathMap != nil {
			check.markImports(imp)
		}
		return imp
	}

	// something went wrong (importer may have returned incomplete package without error)
	return nil
}