Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
panic: runtime error: index out of range [0] with length 0

goroutine 1 [running]:
main.instrumentForCoverage(0xc000098140, {0x7ffd14866c22, 0x44}, {0x65ea54, 0x5}, {0x0, 0x0, 0xffffffff0005a6c0?}, {0xc0000000d8, 0x15}, ...)
	./cover.go:50 +0x7a5
main.compileArchive(_, {_, _}, {_, _}, {{0xc0000a2500, 0x1, 0x2}, {0x0, 0x0, ...}, ...}, ...)
	./compilepkg.go:316 +0x1945
main.compilePkg({0xc000014e28?, 0x7ffd148668c2?, 0x36?})
	./compilepkg.go:107 +0x14f9
main.main()
	./builder.go:75 +0x4c2