github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/golang/lint/testdata/var-decl.go (about)

     1  // Test for redundant type declaration.
     2  
     3  // Package foo ...
     4  package foo
     5  
     6  import "fmt"
     7  import "net/http"
     8  
     9  // Q is a test type.
    10  type Q bool
    11  
    12  var myInt int = 7                           // MATCH /should.*int.*myInt.*inferred/
    13  var mux *http.ServeMux = http.NewServeMux() // MATCH /should.*\*http\.ServeMux.*inferred/
    14  
    15  var myZeroInt int = 0         // MATCH /should.*= 0.*myZeroInt.*zero value/
    16  var myZeroFlt float32 = 0.    // MATCH /should.*= 0\..*myZeroFlt.*zero value/
    17  var myZeroF64 float64 = 0.0   // MATCH /should.*= 0\..*myZeroF64.*zero value/
    18  var myZeroImg complex64 = 0i  // MATCH /should.*= 0i.*myZeroImg.*zero value/
    19  var myZeroStr string = ""     // MATCH /should.*= "".*myZeroStr.*zero value/
    20  var myZeroRaw string = ``     // MATCH /should.*= ``.*myZeroRaw.*zero value/
    21  var myZeroPtr *Q = nil        // MATCH /should.*= nil.*myZeroPtr.*zero value/
    22  var myZeroRune rune = '\x00'  // MATCH /should.*= '\\x00'.*myZeroRune.*zero value/
    23  var myZeroRune2 rune = '\000' // MATCH /should.*= '\\000'.*myZeroRune2.*zero value/
    24  
    25  // No warning because there's no type on the LHS
    26  var x = 0
    27  
    28  // This shouldn't get a warning because there's no initial values.
    29  var str fmt.Stringer
    30  
    31  // No warning because this is a const.
    32  const k uint64 = 7
    33  
    34  const num = 123
    35  
    36  // No warning because the var's RHS is known to be an untyped const.
    37  var flags uint32 = num
    38  
    39  // No warnings because the RHS is an ideal int, and the LHS is a different int type.
    40  var userID int64 = 1235
    41  var negID int64 = -1
    42  var parenID int64 = (17)
    43  var crazyID int64 = -(-(-(-9)))
    44  
    45  // Same, but for strings and floats.
    46  type stringT string
    47  type floatT float64
    48  
    49  var stringV stringT = "abc"
    50  var floatV floatT = 123.45
    51  
    52  // No warning because the LHS names an interface type.
    53  var data interface{} = googleIPs
    54  var googleIPs []int
    55  
    56  // No warning because it's a common idiom for interface satisfaction.
    57  var _ Server = (*serverImpl)(nil)
    58  
    59  // Server is a test type.
    60  type Server interface{}
    61  type serverImpl struct{}
    62  
    63  // LHS is a different type than the RHS.
    64  var myStringer fmt.Stringer = q(0)
    65  
    66  // We don't figure out the true types of LHS and RHS here,
    67  // but io.Writer is a known weaker type for many common uses,
    68  // so the suggestion should be suppressed here.
    69  var out io.Writer = os.Stdout
    70  
    71  // This next one, however, should be type checked.
    72  var out2 io.Writer = newWriter() // MATCH /should.*io\.Writer/
    73  
    74  func newWriter() io.Writer { return nil }
    75  
    76  var y string = q(1).String() // MATCH /should.*string/
    77  
    78  type q int
    79  
    80  func (q) String() string { return "I'm a q" }