Vet examines Go source code and reports suspicious constructs, such as Printf
calls whose arguments do not align with the format string. Vet uses heuristics
that do not guarantee all reports are genuine problems, but it can find errors
not caught by the compilers.
Vet is normally invoked through the go command.
This command vets the package in the current directory:
whereas this one vets the packages whose path is provided:
go vet my/project/...
Use "go help packages" to see other ways of specifying which packages to vet.
Vet's exit code is non-zero for erroneous invocation of the tool or if a
problem was reported, and 0 otherwise. Note that the tool does not
check every possible problem and depends on unreliable heuristics,
so it should be used as guidance only, not as a firm indicator of
To list the available checks, run "go tool vet help":
asmdecl report mismatches between assembly files and Go declarations
assign check for useless assignments
atomic check for common mistakes using the sync/atomic package
bools check for common mistakes involving boolean operators
buildtag check that +build tags are well-formed and correctly located
cgocall detect some violations of the cgo pointer passing rules
composites check for unkeyed composite literals
copylocks check for locks erroneously passed by value
httpresponse check for mistakes using HTTP responses
loopclosure check references to loop variables from within nested functions
lostcancel check cancel func returned by context.WithCancel is called
nilfunc check for useless comparisons between functions and nil
printf check consistency of Printf format strings and arguments
shift check for shifts that equal or exceed the width of the integer
stdmethods check signature of methods of well-known interfaces
structtag check that struct field tags conform to reflect.StructTag.Get
tests check for common mistaken usages of tests and examples
unmarshal report passing non-pointer or non-interface values to unmarshal
unreachable check for unreachable code
unsafeptr check for invalid conversions of uintptr to unsafe.Pointer
unusedresult check for unused results of calls to some functions
For details and flags of a particular check, such as printf, run "go tool vet help printf".
By default, all checks are performed.
If any flags are explicitly set to true, only those tests are run.
Conversely, if any flag is explicitly set to false, only those tests are disabled.
Thus -printf=true runs the printf check,
and -printf=false runs all checks except the printf check.
For information on writing a new check, see golang.org/x/tools/go/analysis.
display offending line plus N lines of surrounding context
emit analysis diagnostics (and errors) in JSON format