modernc.org/gc@v1.0.1-0.20240304020402-f0dba7c97c2b/testdata/errchk/test/chan (about) doubleselect.go fifo.go goroutines.go nonblock.go perm.go powser1.go powser2.go select.go select2.go select3.go select4.go select5.go select6.go select7.go sendstmt.go sieve1.go sieve2.go zerosize.go