| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/mobile/asset | Package asset provides access to application-bundled assets. |
| golang.org/x/mobile/bind/testpkg/secondpkg | Package secondpkg is imported by bind tests that verify that a bound package can reference another bound package. |
| golang.org/x/mobile/bind/testpkg/simplepkg | Package simplepkg is imported from testpkg and tests two corner cases. |
| golang.org/x/mobile/bind/testpkg/unboundpkg | Package simplepkg is imported from testpkg and tests that references to other, unbound packages, are ignored. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| log | Package log implements a simple logging package. |
| math | Package math provides basic constants and mathematical functions. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| time | Package time provides functionality for measuring and displaying time. |