error_(sel.Pos(), `cannot define new methods on non-local type %s`, &buf)
					}
				}
			}
		}

	}
	if !sawC {
		error_(ast1.Package, `cannot find import "C"`)
	}

	// In ast2, strip the import "C" line.
	if *godefs {
		w := 0
		for _, decl := range ast2.Decls {
			d, ok := decl.(*ast.GenDecl)
			if !ok {
				ast2.Decls[w] = decl
				w++
				continue
			}
			ws := 0

	)

Any package using cgo imports "runtime/cgo", which provides
initializations for these variables. It sets iscgo to true, _cgo_init
to a gcc-compiled function that can be called early during program
startup, and _cgo_thread_start to a gcc-compiled function that can be
used to create a new thread, in place of the runtime's usual direct
system calls.

Internal and External Linking

				isFuncSym := strings.HasSuffix(test.input, "(SB)") &&
					// Ignore static symbols.
					!strings.Contains(test.input, "<>")

				wantName := ""
				if isFuncSym {
					// Strip $|* and (SB) and +Int.
					wantName = test.output[:len(test.output)-4]
					if strings.HasPrefix(wantName, "$") || strings.HasPrefix(wantName, "*") {
						wantName = wantName[1:]
					}