Packages supported by TinyGo

The following table shows all Go standard library packages and whether they can be imported by TinyGo. If they can’t, you can click the ’no’ link to jump to the explanation why the package cannot be compiled.

Note that the fact they can be imported, does not mean that all functions and types in the program can be used. For example, sometimes using some functions or types of the package will still trigger compiler errors.

Test results are for linux/amd64.

Some tests are skipped because they use functionality that TinyGo does not implement. Some packages are also tested with a larger stack than the default. This is the same procedure that the TinyGo CI uses. These are the skipped tests.

  • TestExtraMethods
  • TestParseAndBytesRoundTrip/P256/Generic
  • TestAsValidation
  • TestUnmarshalNestingLimitSlice
  • TestUnmarshalNestingLimitStruct
Package Importable Passes tests
archive/tar ✔ yes ✔ yes
archive/zip ✔ yes ✔ yes
bufio ✔ yes ✗ no
bytes ✔ yes ✗ no
cmp ✔ yes ✔ yes
compress/bzip2 ✔ yes ✔ yes
compress/flate ✔ yes ✔ yes
compress/gzip ✔ yes ✔ yes
compress/lzw ✔ yes ✔ yes
compress/zlib ✔ yes ✔ yes
container/heap ✔ yes ✔ yes
container/list ✔ yes ✔ yes
container/ring ✔ yes ✔ yes
context ✔ yes ✔ yes
crypto ✔ yes ✗ no
crypto/aes ✔ yes ✔ yes
crypto/cipher ✔ yes ✗ no
crypto/des ✔ yes ✔ yes
crypto/dsa ✔ yes ✔ yes
crypto/ecdh ✔ yes ✔ yes
crypto/ecdsa ✔ yes ✔ yes
crypto/ed25519 ✔ yes ✔ yes
crypto/elliptic ✔ yes ✔ yes
crypto/fips140 ✔ yes ✔ yes
crypto/hkdf ✔ yes ✔ yes
crypto/hmac ✔ yes ✔ yes
crypto/hpke ✔ yes ✔ yes
crypto/md5 ✔ yes ✔ yes
crypto/mldsa ✔ yes ✗ no
crypto/mlkem ✔ yes ✔ yes
crypto/mlkem/mlkemtest ✔ yes ✔ yes
crypto/pbkdf2 ✔ yes ✔ yes
crypto/rand ✔ yes ✔ yes
crypto/rc4 ✔ yes ✔ yes
crypto/rsa ✔ yes ✗ no
crypto/sha1 ✔ yes ✔ yes
crypto/sha256 ✔ yes ✔ yes
crypto/sha3 ✔ yes ✔ yes
crypto/sha512 ✔ yes ✔ yes
crypto/subtle ✔ yes ✗ no
crypto/tls ✔ yes ✔ yes
crypto/x509 ✔ yes ✗ no
crypto/x509/pkix ✔ yes ✔ yes
database/sql ✔ yes ✗ no
database/sql/driver ✔ yes ✔ yes
debug/buildinfo ✗ no ✗ no
debug/dwarf ✔ yes ✔ yes
debug/elf ✔ yes ✔ yes
debug/gosym ✗ no ✗ no
debug/macho ✔ yes ✔ yes
debug/pe ✔ yes ✔ yes
debug/plan9obj ✔ yes ✔ yes
embed ✔ yes ✔ yes
encoding ✔ yes ✔ yes
encoding/ascii85 ✔ yes ✔ yes
encoding/asn1 ✔ yes ✔ yes
encoding/base32 ✔ yes ✔ yes
encoding/base64 ✔ yes ✔ yes
encoding/binary ✔ yes ✔ yes
encoding/csv ✔ yes ✔ yes
encoding/gob ✔ yes ✗ no
encoding/hex ✔ yes ✔ yes
encoding/json ✔ yes ✗ no
encoding/json/jsontext ✔ yes ✗ no
encoding/json/v2 ✔ yes ✗ no
encoding/pem ✔ yes ✗ no
encoding/xml ✔ yes ✔ yes
errors ✔ yes ✔ yes
expvar ✔ yes ✔ yes
flag ✔ yes ✗ no
fmt ✔ yes ✗ no
go/ast ✔ yes ✔ yes
go/build ✔ yes ✗ no
go/build/constraint ✔ yes ✗ no
go/constant ✔ yes ✗ no
go/doc ✔ yes ✗ no
go/doc/comment ✔ yes ✔ yes
go/format ✔ yes ✔ yes
go/importer ✗ no ✗ no
go/parser ✔ yes ✗ no
go/printer ✔ yes ✗ no
go/scanner ✔ yes ✔ yes
go/token ✔ yes ✔ yes
go/types ✗ no ✗ no
go/version ✔ yes ✔ yes
hash ✔ yes ✔ yes
hash/adler32 ✔ yes ✔ yes
hash/crc32 ✔ yes ✔ yes
hash/crc64 ✔ yes ✔ yes
hash/fnv ✔ yes ✔ yes
hash/maphash ✗ no ✗ no
html ✔ yes ✔ yes
html/template ✔ yes ✗ no
image ✔ yes ✔ yes
image/color ✔ yes ✗ no
image/color/palette ✔ yes ✔ yes
image/draw ✔ yes ✔ yes
image/gif ✔ yes ✔ yes
image/jpeg ✔ yes ✗ no
image/png ✔ yes ✔ yes
index/suffixarray ✔ yes ✔ yes
io ✔ yes ✗ no
io/fs ✔ yes ✔ yes
io/ioutil ✔ yes ✔ yes
iter ✔ yes ✗ no
log ✔ yes ✗ no
log/slog ✔ yes ✗ no
log/syslog ✔ yes ✗ no
maps ✔ yes ✔ yes
math ✔ yes ✔ yes
math/big ✔ yes ✗ no
math/bits ✔ yes ✗ no
math/cmplx ✔ yes ✔ yes
math/rand ✔ yes ✗ no
math/rand/v2 ✔ yes ✗ no
mime ✔ yes ✔ yes
mime/multipart ✔ yes ✔ yes
mime/quotedprintable ✔ yes ✔ yes
net ✔ yes ✔ yes
net/http ✔ yes ✔ yes
net/http/cgi ✗ no ✗ no
net/http/cookiejar ✗ no ✗ no
net/http/fcgi ✗ no ✗ no
net/http/httptest ✔ yes ✔ yes
net/http/httptrace ✔ yes ✔ yes
net/http/httputil ✔ yes ✔ yes
net/http/pprof ✗ no ✗ no
net/mail ✔ yes ✔ yes
net/netip ✔ yes ✗ no
net/rpc ✔ yes ✗ no
net/rpc/jsonrpc ✔ yes ✗ no
net/smtp ✔ yes ✗ no
net/textproto ✔ yes ✔ yes
net/url ✔ yes ✔ yes
os ✔ yes ✔ yes
os/exec ✔ yes ✗ no
os/signal ✔ yes ✗ no
os/user ✔ yes ✔ yes
path ✔ yes ✔ yes
path/filepath ✔ yes ✗ no
plugin ✗ no ✗ no
reflect ✔ yes ✔ yes
regexp ✔ yes ✗ no
regexp/syntax ✔ yes ✔ yes
slices ✔ yes ✗ no
sort ✔ yes ✔ yes
strconv ✔ yes ✔ yes
strings ✔ yes ✗ no
structs ✔ yes ✔ yes
sync ✔ yes ✔ yes
sync/atomic ✔ yes ✗ no
syscall ✔ yes ✗ no
testing ✔ yes ✔ yes
testing/cryptotest ✔ yes ✗ no
testing/fstest ✔ yes ✔ yes
testing/iotest ✔ yes ✔ yes
testing/quick ✔ yes ✗ no
testing/slogtest ✔ yes ✗ no
testing/synctest ✔ yes ✗ no
text/scanner ✔ yes ✔ yes
text/tabwriter ✔ yes ✔ yes
text/template ✔ yes ✗ no
text/template/parse ✔ yes ✔ yes
time ✔ yes ✗ no
time/tzdata ✗ no ✗ no
unicode ✔ yes ✔ yes
unicode/utf16 ✔ yes ✔ yes
unicode/utf8 ✔ yes ✔ yes
unique ✔ yes ✔ yes
unsafe ✔ yes ✔ yes
uuid ✔ yes ✗ no
weak ✔ yes ✗ no

bufio

The compiler gave the following error when running the tests for this package:

FAIL	bufio	0.000s
# bufio_test
/home/ron/.gvm/go/src/bufio/net_test.go:31:21: undefined: net.ListenUnix
/home/ron/.gvm/go/src/bufio/net_test.go:70:25: undefined: net.DialUnix

bytes

The compiler gave the following error when running the tests for this package:

GC Warning: Failed to expand heap by 9007199254741120 KiB
GC Warning: Failed to expand heap by 9007199254740992 KiB
GC Warning: Out of Memory! Heap size: 35 MiB. Returning NULL!
fatal error: gc: out of memory
FAIL	bytes	4.883s

crypto

The compiler gave the following error when running the tests for this package:

--- FAIL: TestDisallowedAssemblyInstructions (0.00s)
    lstat /usr/local/go/src/crypto: file does not exist
FAIL
FAIL	crypto	0.019s

crypto/cipher

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/cipher	0.027s

crypto/mldsa

The compiler gave the following error when running the tests for this package:

[...no test output...]

crypto/rsa

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	crypto/rsa	0.011s

crypto/subtle

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumIn()
FAIL	crypto/subtle	0.002s

crypto/x509

The compiler gave the following error when running the tests for this package:

FAIL	crypto/x509	0.000s
# crypto/x509
/home/ron/.gvm/go/src/crypto/x509/verify_test.go:1549:31: undefined: rand.Text

database/sql

The compiler gave the following error when running the tests for this package:

FAIL	database/sql	0.000s
# database/sql
/home/ron/.gvm/go/src/database/sql/sql_test.go:5264:4: b.SetParallelism undefined (type *testing.B has no field or method SetParallelism)

debug/buildinfo

The compiler gave the following error when this package was imported:

# debug/buildinfo
/home/ron/.gvm/go/src/debug/buildinfo/buildinfo.go:93:19: undefined: debug.ParseBuildInfo

debug/gosym

The compiler gave the following error when this package was imported:

# debug/gosym
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:221:17: undefined: abi.PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:222:17: undefined: abi.PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:225:22: undefined: abi.Go12PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:227:22: undefined: abi.Go12PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:229:22: undefined: abi.Go116PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:231:22: undefined: abi.Go116PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:233:22: undefined: abi.Go118PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:235:22: undefined: abi.Go118PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:237:22: undefined: abi.Go120PCLnTabMagic
/home/ron/.gvm/go/src/debug/gosym/pclntab.go:239:22: undefined: abi.Go120PCLnTabMagic

encoding/gob

The compiler gave the following error when running the tests for this package:

panic: nil pointer dereference
FAIL	encoding/gob	0.005s

encoding/json

The compiler gave the following error when running the tests for this package:

FAIL	encoding/json	0.000s
/home/ron/.gvm/go/src/testing/synctest/synctest.go:291: linker could not find symbol internal/synctest.Run
/home/ron/.gvm/go/src/testing/synctest/synctest.go:292: linker could not find symbol testing/synctest.testingSynctestTest

encoding/json/jsontext

The compiler gave the following error when running the tests for this package:

FAIL	encoding/json/jsontext	0.066s

encoding/json/v2

The compiler gave the following error when running the tests for this package:

FAIL	encoding/json/v2	0.000s
# encoding/json/v2_test
too many levels of pointers for typecode: *****bool
too many levels of pointers for typecode: ******bool
too many levels of pointers for typecode: *******bool
too many levels of pointers for typecode: ********bool
too many levels of pointers for typecode: *********bool
too many levels of pointers for typecode: **********bool
too many levels of pointers for typecode: ***********bool
too many levels of pointers for typecode: *****bool
too many levels of pointers for typecode: ******bool
too many levels of pointers for typecode: *******bool
too many levels of pointers for typecode: ********bool
too many levels of pointers for typecode: *********bool
too many levels of pointers for typecode: **********bool
[...more lines following...]

encoding/pem

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	encoding/pem	0.934s

flag

The compiler gave the following error when running the tests for this package:

--- FAIL: TestExitCode (0.00s)
    unexpected exit code for test case {flag:-h flagHandle: expectExit:0} 
        : got -1, expect 0
    unexpected exit code for test case {flag:-help flagHandle: expectExit:0} 
        : got -1, expect 0
    unexpected exit code for test case {flag:-undefined flagHandle: expectExit:2} 
        : got -1, expect 2
    unexpected exit code for test case {flag:-h flagHandle:h expectExit:123} 
        : got -1, expect 123
    unexpected exit code for test case {flag:-help flagHandle:help expectExit:123} 
        : got -1, expect 123
--- FAIL: TestDefineAfterSet (0.00s)
    DefineAfterSet
        : expected panic("flag myFlag set at .*/flag_test.go:.* before being defined"), but got panic("flag myFlag set at ?:0 before being defined")
FAIL
[...more lines following...]

fmt

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Value).Method()
FAIL	fmt	0.001s

go/build

The compiler gave the following error when running the tests for this package:

--- FAIL: TestDotSlashImport (0.00s)
    import ".": unknown compiler "tinygo"
--- FAIL: TestLocalDirectory (0.00s)
    import ".": unknown compiler "tinygo"
--- FAIL: TestImportCmd (0.00s)
    go/build: go list cmd/internal/objfile: files setting not implemented
        
        
--- FAIL: TestIssue23594 (0.00s)
    could not import testdata: import ".": unknown compiler "tinygo"
--- FAIL: TestCgoImportsIgnored (0.00s)
    import ".": unknown compiler "tinygo"
--- FAIL: TestAllTags (0.00s)
    import ".": unknown compiler "tinygo"
--- FAIL: TestAllTagsNonSourceFile (0.00s)
[...more lines following...]

go/build/constraint

The compiler gave the following error when running the tests for this package:

FAIL	go/build/constraint	0.011s

go/constant

The compiler gave the following error when running the tests for this package:

--- FAIL: TestOps (0.00s)
    0 % 0 = "runtime_error:_integer_divide_by_zero": got "divide by zero"; want "runtime error: integer divide by zero"
FAIL
FAIL	go/constant	0.005s

go/doc

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	go/doc	0.001s

go/importer

This package cannot be imported because the following dependencies cannot be compiled:

go/parser

The compiler gave the following error when running the tests for this package:

FAIL	go/parser	0.038s

go/printer

The compiler gave the following error when running the tests for this package:

FAIL	go/printer	0.039s

go/types

This package cannot be imported because the following dependencies cannot be compiled:

hash/maphash

The compiler gave the following error when this package was imported:

# internal/runtime/maps
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:298:39: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:305:40: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:327:25: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:336:42: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:346:26: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:350:32: undefined: abi.MapGroupSlots
/home/ron/.gvm/go/src/internal/runtime/maps/group.go:362:32: undefined: abi.MapGroupSlots
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:283:21: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:290:17: undefined: abi.MapGroupSlots
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:312:32: undefined: abi.MapGroupSlots
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:422:28: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:426:35: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:445:38: undefined: abi.MapType
/home/ron/.gvm/go/src/internal/runtime/maps/map.go:465:40: undefined: abi.MapType
[...more lines following...]

html/template

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	html/template	0.002s

image/color

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumIn()
FAIL	image/color	0.001s

image/jpeg

The compiler gave the following error when running the tests for this package:

FAIL	image/jpeg	0.000s
/home/ron/.gvm/go/src/image/jpeg/reader_test.go:253: linker could not find symbol runtime/debug.SetTraceback

io

The compiler gave the following error when running the tests for this package:

--- FAIL: TestMultiWriter_WriteStringSingleAlloc (0.00s)
    num allocations = 0; want 1
--- FAIL: TestMultiWriterSingleChainFlatten (0.00s)
    multiWriter did not flatten chained multiWriters: expected writeDepth 12, got 4
--- FAIL: TestMultiReaderFlatten (0.00s)
    multiReader did not flatten chained multiReaders: expected readDepth 3, got 1
--- FAIL: TestMultiReaderFreesExhaustedReaders (5.00s)
    timeout waiting for collection of buf1
FAIL
FAIL	io	5.037s

iter

The compiler gave the following error when running the tests for this package:

--- FAIL: TestPull (0.00s)
    --- FAIL: TestPull/0 (0.00s)
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
    --- FAIL: TestPull/1 (0.00s)
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
    --- FAIL: TestPull/2 (0.00s)
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
        have 0 extra goroutines, want 1
    --- FAIL: TestPull/3 (0.00s)
        have 0 extra goroutines, want 1
[...more lines following...]

log

The compiler gave the following error when running the tests for this package:

--- FAIL: TestAll (0.00s)
    log output should match "^.*/[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^.*/[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2026/09/01 10:29:09.833603 ???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2026/09/01 10:29:09.833816 ???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2026/09/01 10:29:09.833881 ???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2026/09/01 10:29:09.833938 ???:0: hello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2026/09/01 10:29:09.834000 ???:0: XXXhello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2026/09/01 10:29:09.834661 ???:0: XXXhello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2026/09/01 10:29:09.834699 ???:0: XXXhello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2026/09/01 10:29:09.834734 ???:0: XXXhello 23 world"
[...more lines following...]

log/slog

The compiler gave the following error when running the tests for this package:

panic: runtime.Caller failed
FAIL	log/slog	0.001s

log/syslog

The compiler gave the following error when running the tests for this package:

FAIL	log/syslog	0.000s
# log/syslog
/home/ron/.gvm/go/src/log/syslog/syslog_test.go:35:21: oe.Temporary undefined (type *net.OpError has no field or method Temporary)

math/big

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	math/big	3.922s

math/bits

The compiler gave the following error when running the tests for this package:

--- FAIL: TestDivPanicOverflow (0.00s)
    Div should have panicked when y<=hi
--- FAIL: TestDiv32PanicOverflow (0.00s)
    Div32 should have panicked when y<=hi
--- FAIL: TestDiv64PanicOverflow (0.00s)
    Div64 should have panicked when y<=hi
--- FAIL: TestDivPanicZero (0.00s)
    Div should have panicked when y==0
--- FAIL: TestDiv32PanicZero (0.00s)
    Div32 expected panic: "runtime error: integer divide by zero", got: "divide by zero" 
--- FAIL: TestDiv64PanicZero (0.00s)
    Div64 should have panicked when y==0
FAIL
FAIL	math/bits	0.003s

math/rand

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).Method()
--- FAIL: TestDefaultRace (0.00s)
    --- FAIL: TestDefaultRace/0 (0.00s)
        files setting not implemented
    --- FAIL: TestDefaultRace/1 (0.00s)
        files setting not implemented
    --- FAIL: TestDefaultRace/2 (0.00s)
        files setting not implemented
    --- FAIL: TestDefaultRace/3 (0.00s)
        files setting not implemented
    --- FAIL: TestDefaultRace/4 (0.00s)
        files setting not implemented
    --- FAIL: TestDefaultRace/5 (0.00s)
        files setting not implemented
FAIL	math/rand	2.280s
[...more lines following...]

math/rand/v2

The compiler gave the following error when running the tests for this package:

[...no test output...]

net/http/cgi

The compiler gave the following error when this package was imported:

../../../../../tmp/tinygo-test-159087105/main.go:2:8: package net/http/cgi is not in std (/home/ron/.cache/tinygo/goroot-6e1e5c96d60878ab9fd0c20fbb926c829d01a7953b6da77ca58cb6777f8e4e68/src/net/http/cgi)

net/http/cookiejar

The compiler gave the following error when this package was imported:

../../../../../tmp/tinygo-test-3685785041/main.go:2:8: package net/http/cookiejar is not in std (/home/ron/.cache/tinygo/goroot-6e1e5c96d60878ab9fd0c20fbb926c829d01a7953b6da77ca58cb6777f8e4e68/src/net/http/cookiejar)

net/http/fcgi

This package cannot be imported because the following dependencies cannot be compiled:

net/http/pprof

The compiler gave the following error when this package was imported:

# net/http/pprof
/home/ron/Development/tinygo/tinygo-122/src/net/http/pprof/pprof.go:378:18: undefined: goexperiment.GoroutineLeakProfile

net/netip

The compiler gave the following error when running the tests for this package:

--- FAIL: TestAddrStringAllocs (0.01s)
    --- FAIL: TestAddrStringAllocs/ipv4 (0.00s)
        allocs=0, want 1
    --- FAIL: TestAddrStringAllocs/ipv6 (0.00s)
        allocs=0, want 1
    --- FAIL: TestAddrStringAllocs/ipv6+zone (0.00s)
        allocs=0, want 1
    --- FAIL: TestAddrStringAllocs/ipv4-in-ipv6 (0.00s)
        allocs=0, want 1
    --- FAIL: TestAddrStringAllocs/ipv4-in-ipv6+zone (0.00s)
        allocs=0, want 1
FAIL
FAIL	net/netip	0.041s

net/rpc

The compiler gave the following error when running the tests for this package:

panic: type assert failed
FAIL	net/rpc	0.002s

net/rpc/jsonrpc

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).Method()
FAIL	net/rpc/jsonrpc	0.001s

net/smtp

The compiler gave the following error when running the tests for this package:

FAIL	net/smtp	0.000s
# net/smtp
/home/ron/.gvm/go/src/net/smtp/smtp_test.go:622:19: undefined: tls.X509KeyPair
/home/ron/.gvm/go/src/net/smtp/smtp_test.go:629:17: undefined: tls.Listen
/home/ron/.gvm/go/src/net/smtp/smtp_test.go:631:17: undefined: tls.Listen
/home/ron/.gvm/go/src/net/smtp/smtp_test.go:1040:29: cs.HandshakeComplete undefined (type tls.ConnectionState has no field or method HandshakeComplete)
/home/ron/.gvm/go/src/net/smtp/smtp_test.go:1080:24: undefined: tls.X509KeyPair

os/exec

The compiler gave the following error when running the tests for this package:

FAIL		0.000s
package os/exec_test
	imports internal/poll: build constraints exclude all Go files in /home/ron/.cache/tinygo/goroot-6e1e5c96d60878ab9fd0c20fbb926c829d01a7953b6da77ca58cb6777f8e4e68/src/internal/poll

os/signal

The compiler gave the following error when running the tests for this package:

FAIL	os/signal	0.000s
/home/ron/.gvm/go/src/os/signal/signal_unix.go:61: linker could not find symbol os/signal.signal_ignored
/home/ron/Development/tinygo/tinygo-122/src/syscall/syscall_linux.go:1127: linker could not find symbol syscall.runtime_doAllThreadsSyscall

path/filepath

The compiler gave the following error when running the tests for this package:

FAIL	path/filepath	0.002s

plugin

The compiler gave the following error when this package was imported:

# plugin
/home/ron/.gvm/go/src/plugin/plugin_dlopen.go:10:6: not implemented: build constraints in #cgo line

regexp

The compiler gave the following error when running the tests for this package:

FAIL	regexp	1.109s

slices

The compiler gave the following error when running the tests for this package:

[...no test output...]

strings

The compiler gave the following error when running the tests for this package:

GC Warning: Failed to expand heap by 9007199254741120 KiB
GC Warning: Failed to expand heap by 9007199254740992 KiB
GC Warning: Out of Memory! Heap size: 15 MiB. Returning NULL!
fatal error: gc: out of memory
FAIL	strings	7.942s

sync/atomic

The compiler gave the following error when running the tests for this package:

[...no test output...]

syscall

The compiler gave the following error when running the tests for this package:

FAIL	syscall	0.000s
# syscall_test
/home/ron/.gvm/go/src/syscall/creds_test.go:53:19: undefined: net.FileConn
/home/ron/.gvm/go/src/syscall/creds_test.go:60:19: undefined: net.FileConn
/home/ron/.gvm/go/src/syscall/syscall_unix_test.go:183:16: undefined: net.FileConn
/home/ron/.gvm/go/src/syscall/syscall_unix_test.go:242:18: undefined: net.FileConn
/home/ron/.gvm/go/src/syscall/syscall_unix_test.go:272:21: uc.WriteMsgUnix undefined (type *net.UnixConn has no field or method WriteMsgUnix)

testing/cryptotest

The compiler gave the following error when running the tests for this package:

FAIL	testing/cryptotest	0.000s
/home/ron/.gvm/go/src/testing/cryptotest/rand.go:52: linker could not find symbol testing.checkParallel

testing/quick

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumIn()
FAIL	testing/quick	0.001s

testing/slogtest

The compiler gave the following error when running the tests for this package:

panic: runtime.Caller failed
FAIL	testing/slogtest	0.001s

testing/synctest

The compiler gave the following error when running the tests for this package:

FAIL	testing/synctest	0.000s
/home/ron/.gvm/go/src/testing/synctest/synctest.go:291: linker could not find symbol internal/synctest.Run
/home/ron/.gvm/go/src/testing/synctest/synctest.go:292: linker could not find symbol testing/synctest.testingSynctestTest
/home/ron/.gvm/go/src/testing/synctest/synctest.go:311: linker could not find symbol internal/synctest.Wait
/home/ron/.gvm/go/src/testing/synctest/synctest.go:311: linker could not find symbol internal/synctest.Wait
/home/ron/.gvm/go/src/testing/synctest/synctest.go:311: linker could not find symbol internal/synctest.Wait

text/template

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	text/template	0.002s

time

The compiler gave the following error when running the tests for this package:

panic: unimplemented: (reflect.Type).NumOut()
FAIL	time	0.009s

time/tzdata

The compiler gave the following error when this package was imported:

/home/ron/Development/tinygo/tinygo-122/src/runtime/scheduler_threads.go:27: linker could not find symbol time.registerLoadFromEmbeddedTZData

uuid

The compiler gave the following error when running the tests for this package:

FAIL	uuid	0.000s
/home/ron/.gvm/go/src/testing/synctest/synctest.go:291: linker could not find symbol internal/synctest.Run
/home/ron/.gvm/go/src/testing/synctest/synctest.go:292: linker could not find symbol testing/synctest.testingSynctestTest

weak

The compiler gave the following error when running the tests for this package:

FAIL	weak	0.000s
/home/ron/.gvm/go/src/weak/pointer.go: linker could not find symbol weak.runtime_makeStrongFromWeak
/home/ron/.gvm/go/src/weak/pointer.go: linker could not find symbol weak.runtime_makeStrongFromWeak
Last modified September 1, 2026: imports: generate the stdlib table like the TinyGo CI does (0947242)