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.

Package	Importable	Passes tests
archive/tar	✔ yes	✗ no
archive/zip	✔ yes	✔ yes
bufio	✔ yes	✗ no
bytes	✔ yes	✗ no
cmp	✔ yes	✔ yes
compress/bzip2	✔ yes	✔ yes
compress/flate	✔ yes	✔ yes
compress/gzip	✔ yes	✗ no
compress/lzw	✔ yes	✔ yes
compress/zlib	✔ yes	✔ yes
container/heap	✔ yes	✔ yes
container/list	✔ yes	✔ yes
container/ring	✔ yes	✔ yes
context	✔ yes	✗ no
crypto	✔ yes	✗ no
crypto/aes	✔ yes	✗ no
crypto/cipher	✔ yes	✗ no
crypto/des	✔ yes	✔ yes
crypto/dsa	✔ yes	✔ yes
crypto/ecdh	✔ yes	✗ no
crypto/ecdsa	✔ yes	✗ no
crypto/ed25519	✔ yes	✗ no
crypto/elliptic	✔ yes	✔ yes
crypto/fips140	✔ yes	✔ yes
crypto/hkdf	✔ yes	✔ yes
crypto/hmac	✔ yes	✗ no
crypto/md5	✔ yes	✔ yes
crypto/mlkem	✔ yes	✔ yes
crypto/pbkdf2	✔ yes	✔ yes
crypto/rand	✔ yes	✔ yes
crypto/rc4	✔ yes	✗ no
crypto/rsa	✔ yes	✗ no
crypto/sha1	✔ yes	✔ yes
crypto/sha256	✔ yes	✗ no
crypto/sha3	✔ yes	✔ yes
crypto/sha512	✔ yes	✗ no
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	✔ yes	✗ no
debug/macho	✔ yes	✔ yes
debug/pe	✔ yes	✗ no
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	✗ no
encoding/csv	✔ yes	✔ yes
encoding/gob	✔ yes	✗ no
encoding/hex	✔ yes	✔ yes
encoding/json	✔ yes	✗ no
encoding/pem	✔ yes	✗ no
encoding/xml	✔ yes	✔ yes
errors	✔ yes	✗ no
expvar	✔ yes	✔ yes
flag	✔ yes	✗ no
fmt	✔ yes	✗ no
go/ast	✔ yes	✔ yes
go/build	✔ yes	✗ no
go/build/constraint	✔ yes	✔ yes
go/constant	✔ yes	✗ no
go/doc	✔ yes	✗ no
go/doc/comment	✔ yes	✗ no
go/format	✔ yes	✔ yes
go/importer	✔ yes	✗ no
go/parser	✔ yes	✗ no
go/printer	✔ yes	✔ yes
go/scanner	✔ yes	✔ yes
go/token	✔ yes	✗ no
go/types	✔ yes	✗ no
go/version	✔ yes	✔ yes
hash	✔ yes	✔ yes
hash/adler32	✔ yes	✔ yes
hash/crc32	✔ yes	✗ no
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	✗ no
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	✗ no	✗ no
net/http/pprof	✗ no	✗ no
net/mail	✔ yes	✔ yes
net/netip	✔ yes	✗ no
net/rpc	✔ yes	✗ no
net/rpc/jsonrpc	✔ yes	✗ no
net/smtp	✗ no	✗ no
net/textproto	✔ yes	✔ yes
net/url	✔ yes	✗ no
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	✔ yes
regexp/syntax	✔ yes	✔ yes
slices	✔ yes	✗ no
sort	✔ yes	✗ no
strconv	✔ yes	✔ yes
strings	✔ yes	✗ no
structs	✔ yes	✔ yes
sync	✔ yes	✔ yes
sync/atomic	✔ yes	✗ no
syscall	✔ yes	✗ no
testing	✔ yes	✔ yes
testing/fstest	✔ yes	✗ no
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
weak	✔ yes	✗ no

archive/tar

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

[tinygo: panic at <Go interface method>]
panic: runtime error at 0x000000000027f886: nil pointer dereference
FAIL	archive/tar	1.413s

bufio

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

FAIL	bufio	0.000s
# bufio_test
/home/ron/.gvm/gos/go1.25.5/src/bufio/net_test.go:31:21: undefined: net.ListenUnix
/home/ron/.gvm/gos/go1.25.5/src/bufio/net_test.go:70:25: undefined: net.DialUnix

bytes

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

FAIL	bytes	0.000s
# bytes_test
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rng.go:239:6: interp: running for more than 3m0s, timing out (executed calls: 582422)
  %0 = icmp eq ptr %rng, null, !dbg !19942

traceback:
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rng.go:239:6:
  %0 = icmp eq ptr %rng, null, !dbg !19942
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rng.go:234:25:
  %0 = call i64 @"(*math/rand.rngSource).Uint64"(ptr %rng, ptr undef), !dbg !19939
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rand.go:96:50:
  %4 = call i64 @"interface:{Int63:func:{}{basic:int64},Seed:func:{basic:int64}{}}.Int63$invoke"(ptr %invoke.func.value, ptr %invoke.func.typecode, ptr undef), !dbg !19933
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rand.go:110:52:
  %0 = call i64 @"(*math/rand.Rand).Int63"(ptr %r, ptr undef), !dbg !19932
/home/ron/.gvm/gos/go1.25.5/src/math/rand/rand.go:145:14:
[...more lines following...]

compress/gzip

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

--- FAIL: TestGZIPFilesHaveZeroMTimes (0.00s)
    skipping test on non-builder
    SkipNow is incomplete, requires runtime.Goexit()
    error evaluating GOROOT:  lstat /usr/local/go: file does not exist
    FailNow is incomplete, requires runtime.Goexit()
    skipping: GOROOT directory not found: /usr/local/go
    SkipNow is incomplete, requires runtime.Goexit()
    error collecting list of .gz files in GOROOT:  lstat : file does not exist
    FailNow is incomplete, requires runtime.Goexit()
    expected to find some .gz files under GOROOT
    FailNow is incomplete, requires runtime.Goexit()
FAIL
FAIL	compress/gzip	0.551s

context

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

--- FAIL: TestCauseRace (0.00s)
    Cause returned context canceled, want TestCauseRace
FAIL
FAIL	context	0.024s

crypto

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

[tinygo: panic at <Go interface method>]
panic: runtime error at 0x00000000002662d7: nil pointer dereference
FAIL	crypto	1.120s

crypto/aes

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

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/aes	1.091s

crypto/cipher

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

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/cipher	1.097s

crypto/ecdh

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

--- FAIL: TestLinker (0.00s)
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    platform cannot run go tool
    FailNow is incomplete, requires runtime.Goexit()
    [ build -o hello.exe hello.go]: exec: no command
    FailNow is incomplete, requires runtime.Goexit()
    [./hello.exe]: directory setting not implemented
    FailNow is incomplete, requires runtime.Goexit()
    unexpected output: 
    [ tool nm hello.exe]: exec: no command
    FailNow is incomplete, requires runtime.Goexit()
    no P256 symbols found in program using ecdh.P256, test is broken
[...more lines following...]

crypto/ecdsa

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/crypto/ecdsa/ecdsa_test.go:563:6]
panic: runtime error at 0x00000000002bf5e1: index out of range
FAIL	crypto/ecdsa	1.970s

crypto/ed25519

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

--- FAIL: TestEd25519Vectors (0.00s)
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    platform cannot run go tool
    FailNow is incomplete, requires runtime.Goexit()
     env GOMODCACHE: exec: no command
    FailNow is incomplete, requires runtime.Goexit()
    fetching filippo.io/mostly-harmless/ed25519vectors@v0.0.0-20210322192420-30a2d7243a94
    failed to download filippo.io/mostly-harmless/ed25519vectors@v0.0.0-20210322192420-30a2d7243a94: exec: no command
        
    FailNow is incomplete, requires runtime.Goexit()
    failed to parse 'go mod download': unexpected end of JSON input
        
    FailNow is incomplete, requires runtime.Goexit()
    failed to read ed25519vectors.json: open ed25519vectors.json: file does not exist
[...more lines following...]

crypto/hmac

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

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/hmac	1.141s

crypto/rc4

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/crypto/rc4/rc4.go]
panic: runtime error at 0x00000000002607c7: index out of range
FAIL	crypto/rc4	1.140s

crypto/rsa

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

panic: unimplemented: (reflect.Type).NumOut()
FAIL	crypto/rsa	1.101s

crypto/sha256

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

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/sha256	1.165s

crypto/sha512

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

panic: unimplemented: (reflect.Type).Method()
FAIL	crypto/sha512	2.168s

crypto/subtle

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

panic: unimplemented: (reflect.Type).NumIn()
FAIL	crypto/subtle	2.273s

crypto/x509

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

FAIL	crypto/x509	0.000s
# crypto/x509_test
/home/ron/.gvm/gos/go1.25.5/src/crypto/x509/hybrid_pool_test.go:63:17: c.ConnectionState undefined (type *net.TLSConn has no field or method ConnectionState)

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/gos/go1.25.5/src/database/sql/sql_test.go:4840:4: 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/gos/go1.25.5/src/debug/buildinfo/buildinfo.go:93:19: undefined: debug.ParseBuildInfo

debug/gosym

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/debug/elf/file.go:129:5]
panic: runtime error at 0x000000000026cff6: nil pointer dereference
FAIL	debug/gosym	1.167s

debug/pe

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/debug/pe/file_test.go]
panic: runtime error at 0x000000000028a7f4: index out of range
FAIL	debug/pe	1.122s

encoding/binary

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/encoding/binary/binary.go:116:7]
panic: runtime error at 0x000000000025c723: index out of range
FAIL	encoding/binary	1.091s

encoding/gob

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

panic: reflect: unimplemented: AssignableTo with interface
FAIL	encoding/gob	1.110s

encoding/json

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

FAIL	encoding/json	0.000s
# encoding/json
/home/ron/.gvm/gos/go1.25.5/src/encoding/json/encode_test.go:1415:6: wg.Go undefined (type sync.WaitGroup has no field or method Go)

encoding/pem

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

panic: unimplemented: (reflect.Type).NumOut()
FAIL	encoding/pem	1.567s

errors

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

--- FAIL: TestAs (0.00s)
    --- FAIL: TestAs/8:As(Errorf(...,_err),_0x73ef014b8840) (0.00s)
        match: got true; want false
        FailNow is incomplete, requires runtime.Goexit()
        got &errors.errorString{s:"err"}, want <nil>
        FailNow is incomplete, requires runtime.Goexit()
    --- FAIL: TestAs/10:As(Errorf(...,_path_error),_0x73ef014b8840) (0.00s)
        got errors_test.wrapped{msg:"path error", err:(*fs.PathError)(0x73ef014c1d80)}, want &fs.PathError{Op:"open", Path:"non-existing", Err:(*errors.errorString)(0x267b88)}
        FailNow is incomplete, requires runtime.Goexit()
    --- FAIL: TestAs/16:As(Errorf(...,_multiError),_0x73ef014b8840) (0.00s)
        got errors_test.multiErr{errors_test.wrapped{msg:"path error", err:(*fs.PathError)(0x73ef014c1d80)}}, want &fs.PathError{Op:"open", Path:"non-existing", Err:(*errors.errorString)(0x267b88)}
        FailNow is incomplete, requires runtime.Goexit()
FAIL
FAIL	errors	0.001s

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	1.093s

go/build

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

--- FAIL: TestDotSlashImport (0.00s)
    import ".": unknown compiler "tinygo"
    FailNow is incomplete, requires runtime.Goexit()
    import "./file": unknown compiler "tinygo"
    FailNow is incomplete, requires runtime.Goexit()
--- FAIL: TestLocalDirectory (0.00s)
    import ".": unknown compiler "tinygo"
    FailNow is incomplete, requires runtime.Goexit()
    ImportPath=".", want "go/build"
    FailNow is incomplete, requires runtime.Goexit()
--- FAIL: TestImportCmd (0.00s)
    go/build: go list cmd/internal/objfile: files setting not implemented
        
        
    FailNow is incomplete, requires runtime.Goexit()
[...more lines following...]

go/constant

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/go/constant/value.go]
panic: runtime error at 0x000000000026b79c: divide by zero
FAIL	go/constant	1.129s

go/doc

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

panic: unimplemented: (reflect.Type).NumOut()
FAIL	go/doc	1.106s

go/doc/comment

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

--- FAIL: TestStd (0.00s)
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    platform cannot run go tool
    FailNow is incomplete, requires runtime.Goexit()
    exec: no command
    FailNow is incomplete, requires runtime.Goexit()
    stdPkgs is out of date: regenerate with 'go generate'
        diff stdPkgs want
        --- stdPkgs
        +++ want
        @@ -1,40 +1,1 @@
        -bufio
        -bytes
        -cmp
[...more lines following...]

go/importer

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

[tinygo: panic at <Go interface method>]
panic: runtime error at 0x000000000033f069: nil pointer dereference
FAIL	go/importer	1.087s

go/parser

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

FAIL	go/parser	1.171s

go/token

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

panic: reflect: unimplemented: AssignableTo with interface
FAIL	go/token	1.135s

go/types

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

FAIL	go/types	0.000s
# go/types_test
/home/ron/.gvm/gos/go1.25.5/src/go/types/self_test.go:102:4: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)

hash/crc32

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

panic: not available
FAIL	hash/crc32	1.152s

hash/maphash

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

# hash/maphash
/home/ron/.gvm/gos/go1.25.5/src/hash/maphash/maphash.go:295:6: undefined: abi.EscapeNonString
/home/ron/.gvm/gos/go1.25.5/src/hash/maphash/maphash.go:301:6: undefined: abi.EscapeNonString

html/template

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

panic: unimplemented: (reflect.Type).NumOut()
FAIL	html/template	1.105s

image/color

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

panic: unimplemented: (reflect.Type).NumIn()
FAIL	image/color	1.095s

image/draw

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

panic: unimplemented: (reflect.Type).NumIn()
FAIL	image/draw	1.158s

image/jpeg

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

FAIL	image/jpeg	0.000s
/home/ron/.gvm/gos/go1.25.5/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
    FailNow is incomplete, requires runtime.Goexit()
FAIL
FAIL	io	5.028s

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$" is "XXX2025/12/15 13:33:52.466132 ???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2025/12/15 13:33:52.466247 ???: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$" is "XXX2025/12/15 13:33:52.466279 ???:0: hello 23 world"
    log output should match "^XXX[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): hello 23 world$" is "XXX2025/12/15 13:33:52.466305 ???: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$" is "2025/12/15 13:33:52.466329 ???:0: XXXhello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] .*/[A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2025/12/15 13:33:52.466443 ???: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$" is "2025/12/15 13:33:52.466548 ???:0: XXXhello 23 world"
    log output should match "^[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9][0-9][0-9][0-9] [A-Za-z0-9_\\-]+\\.go:(67|69): XXXhello 23 world$" is "2025/12/15 13:33:52.466578 ???: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	1.114s

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/gos/go1.25.5/src/log/syslog/syslog_test.go:35:21: oe.Temporary undefined (type *net.OpError has no field or method Temporary)
/home/ron/.gvm/gos/go1.25.5/src/log/syslog/syslog_test.go:110:15: undefined: net.ListenPacket

math/big

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

FAIL	math/big	0.000s
# math/big
/home/ron/.gvm/gos/go1.25.5/src/math/bits/bits.go:472:10: interp: running for more than 3m0s, timing out (executed calls: 31156621)
  %0 = and i64 %x, 4294967295, !dbg !31805

traceback:
/home/ron/.gvm/gos/go1.25.5/src/math/bits/bits.go:472:10:
  %0 = and i64 %x, 4294967295, !dbg !31805
/home/ron/.gvm/gos/go1.25.5/src/math/bits/bits.go:450:15:
  %9 = call { i64, i64 } @"math/bits.Mul64"(i64 %x, i64 %y, ptr undef), !dbg !31813
/home/ron/.gvm/gos/go1.25.5/src/math/big/arith.go:50:20:
  %0 = call { i64, i64 } @"math/bits.Mul"(i64 %x, i64 %y, ptr undef), !dbg !31800
/home/ron/.gvm/gos/go1.25.5/src/math/big/arith.go:250:24:
  %14 = call { i64, i64 } @"math/big.mulAddWWW_g"(i64 %13, i64 %y, i64 %7, ptr undef), !dbg !31817
/home/ron/.gvm/gos/go1.25.5/src/math/big/arith_decl_pure.go:26:20:
[...more lines following...]

math/bits

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/math/bits/bits.go:510:21]
panic: runtime error at 0x000000000022d830: divide by zero
FAIL	math/bits	1.623s

math/rand

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

panic: unimplemented: (reflect.Type).Method()
FAIL	math/rand	3.081s

math/rand/v2

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

panic: unimplemented: (reflect.Type).Method()
FAIL	math/rand/v2	3.623s

net/http/cgi

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

../../../../../tmp/tinygo-test-1980316787/main.go:2:8: package net/http/cgi is not in std (/home/ron/.cache/tinygo/goroot-ab68f8ed5d891c12323b7956a84922b36d555b19c5ca444b3d1f322300c5d23f/src/net/http/cgi)

net/http/cookiejar

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

../../../../../tmp/tinygo-test-3073495770/main.go:2:8: package net/http/cookiejar is not in std (/home/ron/.cache/tinygo/goroot-ab68f8ed5d891c12323b7956a84922b36d555b19c5ca444b3d1f322300c5d23f/src/net/http/cookiejar)

net/http/fcgi

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

• net/http/cgi

net/http/httputil

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

../../../../../tmp/tinygo-test-1974920281/main.go:2:8: package net/http/httputil is not in std (/home/ron/.cache/tinygo/goroot-ab68f8ed5d891c12323b7956a84922b36d555b19c5ca444b3d1f322300c5d23f/src/net/http/httputil)

net/http/pprof

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

../../../../../tmp/tinygo-test-530727302/main.go:2:8: package net/http/pprof is not in std (/home/ron/.cache/tinygo/goroot-ab68f8ed5d891c12323b7956a84922b36d555b19c5ca444b3d1f322300c5d23f/src/net/http/pprof)

net/netip

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

--- FAIL: TestInlining (0.00s)
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    skipping test: 'go build' unavailable: /home/ron/.gvm/gos/go1.25.5/bin/go tool -n compile: files setting not implemented
    SkipNow is incomplete, requires runtime.Goexit()
    platform cannot run go tool
    FailNow is incomplete, requires runtime.Goexit()
    go build: exec: no command, 
    FailNow is incomplete, requires runtime.Goexit()
    "(*uint128).halves" is no longer inlinable
    "Addr.BitLen" is no longer inlinable
    "Addr.hasZone" is no longer inlinable
    "Addr.Is4" is no longer inlinable
    "Addr.Is4In6" is no longer inlinable
    "Addr.Is6" is no longer inlinable
[...more lines following...]

net/rpc

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

panic: reflect: unimplemented: AssignableTo with interface
FAIL	net/rpc	1.101s

net/rpc/jsonrpc

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

panic: reflect: unimplemented: AssignableTo with interface
FAIL	net/rpc/jsonrpc	1.089s

net/smtp

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

# net/smtp
/home/ron/.gvm/gos/go1.25.5/src/net/smtp/smtp.go:72:24: undefined: tls.Conn
/home/ron/.gvm/gos/go1.25.5/src/net/smtp/smtp.go:172:25: undefined: tls.Conn

net/url

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

panic: reflect: unimplemented: AssignableTo with interface
FAIL	net/url	1.112s

os/exec

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

FAIL	os/exec	0.000s
# os/exec_test
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:260:17: undefined: net.FileListener
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:405:92: cmd.ProcessState.Pid undefined (type *os.ProcessState has no field or method Pid)
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:704:34: ln.(*net.TCPListener).File undefined (type *net.TCPListener has no field or method File)
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:709:18: undefined: net.FileListener
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:720:5: ts.StartTLS undefined (type *httptest.Server has no field or method StartTLS)
/home/ron/.gvm/gos/go1.25.5/src/os/exec/exec_test.go:809:35: ln.(*net.TCPListener).File undefined (type *net.TCPListener has no field or method File)

os/signal

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

FAIL	os/signal	0.000s
/home/ron/.gvm/gos/go1.25.5/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: TestWindowsGlob (0.00s)
    skipping windows specific test
    SkipNow is incomplete, requires runtime.Goexit()
    tmpDir path "/tmp/TestWindowsGlob227586258/000" must have drive letter in it
    FailNow is incomplete, requires runtime.Goexit()
    Glob("/tmp/TestWindowsGlob227586258/000\\a") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\a") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\a") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\b") returns [], but ["/tmp/TestWindowsGlob227586258/000\\b"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\b") returns [], but ["/tmp/TestWindowsGlob227586258/000\\b"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\b") returns [], but ["/tmp/TestWindowsGlob227586258/000\\b"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\*") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a" "/tmp/TestWindowsGlob227586258/000\\b" "/tmp/TestWindowsGlob227586258/000\\dir"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\*") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a" "/tmp/TestWindowsGlob227586258/000\\b" "/tmp/TestWindowsGlob227586258/000\\dir"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\*") returns [], but ["/tmp/TestWindowsGlob227586258/000\\a" "/tmp/TestWindowsGlob227586258/000\\b" "/tmp/TestWindowsGlob227586258/000\\dir"] expected
    Glob("/tmp/TestWindowsGlob227586258/000\\d*") returns [], but ["/tmp/TestWindowsGlob227586258/000\\dir"] expected
[...more lines following...]

plugin

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

# plugin
/home/ron/.gvm/gos/go1.25.5/src/plugin/plugin_dlopen.go:10:6: not implemented: build constraints in #cgo line

slices

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/slices/slices.go]
panic: runtime error at 0x000000000028f2a0: slice out of range
FAIL	slices	1.099s

sort

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

--- FAIL: TestCountStableOps (1.02s)
    Counting skipped as non-verbose mode.
    SkipNow is incomplete, requires runtime.Goexit()
    Stable      100 elements:         939 Swap,        809 Less
    Stable      300 elements:        3892 Swap,       2931 Less
    Stable     1000 elements:       19580 Swap,      12290 Less
    Stable     3000 elements:       81917 Swap,      42714 Less
    Stable    10000 elements:      347895 Swap,     165662 Less
    Stable    30000 elements:     1345166 Swap,     559451 Less
    Stable   100000 elements:     5785163 Swap,    2086453 Less
    Stable   300000 elements:    20448330 Swap,    6867550 Less
    Stable  1000000 elements:    84484245 Swap,   25118775 Less
--- FAIL: TestCountSortOps (0.59s)
    Counting skipped as non-verbose mode.
    SkipNow is incomplete, requires runtime.Goexit()
[...more lines following...]

strings

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

FAIL	strings	0.000s
# strings_test
/home/ron/Development/tinygo/tinygo-122/src/runtime/runtime.go:48:6: interp: running for more than 3m0s, timing out (executed calls: 842273)
  call void @llvm.memmove.p0.p0.i64(ptr %dst, ptr %src, i64 %size, i1 false), !dbg !20241

traceback:
/home/ron/Development/tinygo/tinygo-122/src/runtime/runtime.go:48:6:
  call void @llvm.memmove.p0.p0.i64(ptr %dst, ptr %src, i64 %size, i1 false), !dbg !20241
/home/ron/Development/tinygo/tinygo-122/src/runtime/slice.go:21:10:
  call void @runtime.memmove(ptr %7, ptr %elemsBuf, i64 %8, ptr undef), !dbg !20271
/home/ron/.gvm/gos/go1.25.5/src/strings/strings_test.go:1884:13:
  %append.new = call { ptr, i64, i64 } @runtime.sliceAppend(ptr %append.srcBuf, ptr %append.elemsBuf, i64 %append.srcLen, i64 %append.srcCap, i64 %append.elemsLen, i64 1, ptr undef), !dbg !20273
/home/ron/.gvm/gos/go1.25.5/src/strings:
  %56 = call %runtime._string @strings_test.makeBenchInputHard(ptr undef), !dbg !20252

[...more lines following...]

sync/atomic

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

[tinygo: panic at /home/ron/.gvm/gos/go1.25.5/src/sync/atomic/doc.go:93:6]
panic: runtime error at 0x000000000026029b: caught signal SIGSEGV
FAIL	sync/atomic	3.639s

syscall

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

FAIL	syscall	0.000s
# syscall_test
/home/ron/.gvm/gos/go1.25.5/src/syscall/creds_test.go:53:19: undefined: net.FileConn
/home/ron/.gvm/gos/go1.25.5/src/syscall/creds_test.go:60:19: undefined: net.FileConn
/home/ron/.gvm/gos/go1.25.5/src/syscall/syscall_unix_test.go:183:16: undefined: net.FileConn
/home/ron/.gvm/gos/go1.25.5/src/syscall/syscall_unix_test.go:238:14: undefined: net.UnixConn
/home/ron/.gvm/gos/go1.25.5/src/syscall/syscall_unix_test.go:242:18: undefined: net.FileConn

testing/fstest

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

[tinygo: panic at <Go interface method>]
panic: runtime error at 0x0000000000232228: nil pointer dereference
FAIL	testing/fstest	1.108s

testing/quick

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

panic: unimplemented: (reflect.Type).NumIn()
FAIL	testing/quick	1.102s

testing/slogtest

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

panic: runtime.Caller failed
FAIL	testing/slogtest	1.115s

testing/synctest

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

FAIL	testing/synctest	0.000s
# testing/synctest_test
/home/ron/.gvm/gos/go1.25.5/src/testing/synctest/example_test.go:109:4: unknown field DialContext in struct literal of type http.Transport
/home/ron/.gvm/gos/go1.25.5/src/testing/synctest/example_test.go:113:4: unknown field ExpectContinueTimeout in struct literal of type http.Transport

text/template

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

panic: unimplemented: (reflect.Type).NumOut()
FAIL	text/template	1.105s

time

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

FAIL	time	0.000s
# time_test
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:977:4: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:978:4: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:979:4: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:1050:8: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:1051:8: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)
/home/ron/.gvm/gos/go1.25.5/src/time/sleep_test.go:1052:8: b.ReportMetric undefined (type *testing.B has no field or method ReportMetric)

time/tzdata

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

/home/ron/Development/tinygo/tinygo-122/src/runtime/scheduler_threads.go:26: linker could not find symbol time.registerLoadFromEmbeddedTZData

weak

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

FAIL	weak	0.000s
/home/ron/.gvm/gos/go1.25.5/src/weak/pointer.go: linker could not find symbol weak.runtime_makeStrongFromWeak
/home/ron/.gvm/gos/go1.25.5/src/weak/pointer.go: linker could not find symbol weak.runtime_makeStrongFromWeak