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Source file src/go.uber.org/zap/field.go

Documentation: go.uber.org/zap

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package zap
    22  
    23  import (
    24  	"fmt"
    25  	"math"
    26  	"time"
    27  
    28  	"go.uber.org/zap/internal/stacktrace"
    29  	"go.uber.org/zap/zapcore"
    30  )
    31  
    32  // Field is an alias for Field. Aliasing this type dramatically
    33  // improves the navigability of this package's API documentation.
    34  type Field = zapcore.Field
    35  
    36  var (
    37  	_minTimeInt64 = time.Unix(0, math.MinInt64)
    38  	_maxTimeInt64 = time.Unix(0, math.MaxInt64)
    39  )
    40  
    41  // Skip constructs a no-op field, which is often useful when handling invalid
    42  // inputs in other Field constructors.
    43  func Skip() Field {
    44  	return Field{Type: zapcore.SkipType}
    45  }
    46  
    47  // nilField returns a field which will marshal explicitly as nil. See motivation
    48  // in https://github.com/uber-go/zap/issues/753 . If we ever make breaking
    49  // changes and add zapcore.NilType and zapcore.ObjectEncoder.AddNil, the
    50  // implementation here should be changed to reflect that.
    51  func nilField(key string) Field { return Reflect(key, nil) }
    52  
    53  // Binary constructs a field that carries an opaque binary blob.
    54  //
    55  // Binary data is serialized in an encoding-appropriate format. For example,
    56  // zap's JSON encoder base64-encodes binary blobs. To log UTF-8 encoded text,
    57  // use ByteString.
    58  func Binary(key string, val []byte) Field {
    59  	return Field{Key: key, Type: zapcore.BinaryType, Interface: val}
    60  }
    61  
    62  // Bool constructs a field that carries a bool.
    63  func Bool(key string, val bool) Field {
    64  	var ival int64
    65  	if val {
    66  		ival = 1
    67  	}
    68  	return Field{Key: key, Type: zapcore.BoolType, Integer: ival}
    69  }
    70  
    71  // Boolp constructs a field that carries a *bool. The returned Field will safely
    72  // and explicitly represent `nil` when appropriate.
    73  func Boolp(key string, val *bool) Field {
    74  	if val == nil {
    75  		return nilField(key)
    76  	}
    77  	return Bool(key, *val)
    78  }
    79  
    80  // ByteString constructs a field that carries UTF-8 encoded text as a []byte.
    81  // To log opaque binary blobs (which aren't necessarily valid UTF-8), use
    82  // Binary.
    83  func ByteString(key string, val []byte) Field {
    84  	return Field{Key: key, Type: zapcore.ByteStringType, Interface: val}
    85  }
    86  
    87  // Complex128 constructs a field that carries a complex number. Unlike most
    88  // numeric fields, this costs an allocation (to convert the complex128 to
    89  // interface{}).
    90  func Complex128(key string, val complex128) Field {
    91  	return Field{Key: key, Type: zapcore.Complex128Type, Interface: val}
    92  }
    93  
    94  // Complex128p constructs a field that carries a *complex128. The returned Field will safely
    95  // and explicitly represent `nil` when appropriate.
    96  func Complex128p(key string, val *complex128) Field {
    97  	if val == nil {
    98  		return nilField(key)
    99  	}
   100  	return Complex128(key, *val)
   101  }
   102  
   103  // Complex64 constructs a field that carries a complex number. Unlike most
   104  // numeric fields, this costs an allocation (to convert the complex64 to
   105  // interface{}).
   106  func Complex64(key string, val complex64) Field {
   107  	return Field{Key: key, Type: zapcore.Complex64Type, Interface: val}
   108  }
   109  
   110  // Complex64p constructs a field that carries a *complex64. The returned Field will safely
   111  // and explicitly represent `nil` when appropriate.
   112  func Complex64p(key string, val *complex64) Field {
   113  	if val == nil {
   114  		return nilField(key)
   115  	}
   116  	return Complex64(key, *val)
   117  }
   118  
   119  // Float64 constructs a field that carries a float64. The way the
   120  // floating-point value is represented is encoder-dependent, so marshaling is
   121  // necessarily lazy.
   122  func Float64(key string, val float64) Field {
   123  	return Field{Key: key, Type: zapcore.Float64Type, Integer: int64(math.Float64bits(val))}
   124  }
   125  
   126  // Float64p constructs a field that carries a *float64. The returned Field will safely
   127  // and explicitly represent `nil` when appropriate.
   128  func Float64p(key string, val *float64) Field {
   129  	if val == nil {
   130  		return nilField(key)
   131  	}
   132  	return Float64(key, *val)
   133  }
   134  
   135  // Float32 constructs a field that carries a float32. The way the
   136  // floating-point value is represented is encoder-dependent, so marshaling is
   137  // necessarily lazy.
   138  func Float32(key string, val float32) Field {
   139  	return Field{Key: key, Type: zapcore.Float32Type, Integer: int64(math.Float32bits(val))}
   140  }
   141  
   142  // Float32p constructs a field that carries a *float32. The returned Field will safely
   143  // and explicitly represent `nil` when appropriate.
   144  func Float32p(key string, val *float32) Field {
   145  	if val == nil {
   146  		return nilField(key)
   147  	}
   148  	return Float32(key, *val)
   149  }
   150  
   151  // Int constructs a field with the given key and value.
   152  func Int(key string, val int) Field {
   153  	return Int64(key, int64(val))
   154  }
   155  
   156  // Intp constructs a field that carries a *int. The returned Field will safely
   157  // and explicitly represent `nil` when appropriate.
   158  func Intp(key string, val *int) Field {
   159  	if val == nil {
   160  		return nilField(key)
   161  	}
   162  	return Int(key, *val)
   163  }
   164  
   165  // Int64 constructs a field with the given key and value.
   166  func Int64(key string, val int64) Field {
   167  	return Field{Key: key, Type: zapcore.Int64Type, Integer: val}
   168  }
   169  
   170  // Int64p constructs a field that carries a *int64. The returned Field will safely
   171  // and explicitly represent `nil` when appropriate.
   172  func Int64p(key string, val *int64) Field {
   173  	if val == nil {
   174  		return nilField(key)
   175  	}
   176  	return Int64(key, *val)
   177  }
   178  
   179  // Int32 constructs a field with the given key and value.
   180  func Int32(key string, val int32) Field {
   181  	return Field{Key: key, Type: zapcore.Int32Type, Integer: int64(val)}
   182  }
   183  
   184  // Int32p constructs a field that carries a *int32. The returned Field will safely
   185  // and explicitly represent `nil` when appropriate.
   186  func Int32p(key string, val *int32) Field {
   187  	if val == nil {
   188  		return nilField(key)
   189  	}
   190  	return Int32(key, *val)
   191  }
   192  
   193  // Int16 constructs a field with the given key and value.
   194  func Int16(key string, val int16) Field {
   195  	return Field{Key: key, Type: zapcore.Int16Type, Integer: int64(val)}
   196  }
   197  
   198  // Int16p constructs a field that carries a *int16. The returned Field will safely
   199  // and explicitly represent `nil` when appropriate.
   200  func Int16p(key string, val *int16) Field {
   201  	if val == nil {
   202  		return nilField(key)
   203  	}
   204  	return Int16(key, *val)
   205  }
   206  
   207  // Int8 constructs a field with the given key and value.
   208  func Int8(key string, val int8) Field {
   209  	return Field{Key: key, Type: zapcore.Int8Type, Integer: int64(val)}
   210  }
   211  
   212  // Int8p constructs a field that carries a *int8. The returned Field will safely
   213  // and explicitly represent `nil` when appropriate.
   214  func Int8p(key string, val *int8) Field {
   215  	if val == nil {
   216  		return nilField(key)
   217  	}
   218  	return Int8(key, *val)
   219  }
   220  
   221  // String constructs a field with the given key and value.
   222  func String(key string, val string) Field {
   223  	return Field{Key: key, Type: zapcore.StringType, String: val}
   224  }
   225  
   226  // Stringp constructs a field that carries a *string. The returned Field will safely
   227  // and explicitly represent `nil` when appropriate.
   228  func Stringp(key string, val *string) Field {
   229  	if val == nil {
   230  		return nilField(key)
   231  	}
   232  	return String(key, *val)
   233  }
   234  
   235  // Uint constructs a field with the given key and value.
   236  func Uint(key string, val uint) Field {
   237  	return Uint64(key, uint64(val))
   238  }
   239  
   240  // Uintp constructs a field that carries a *uint. The returned Field will safely
   241  // and explicitly represent `nil` when appropriate.
   242  func Uintp(key string, val *uint) Field {
   243  	if val == nil {
   244  		return nilField(key)
   245  	}
   246  	return Uint(key, *val)
   247  }
   248  
   249  // Uint64 constructs a field with the given key and value.
   250  func Uint64(key string, val uint64) Field {
   251  	return Field{Key: key, Type: zapcore.Uint64Type, Integer: int64(val)}
   252  }
   253  
   254  // Uint64p constructs a field that carries a *uint64. The returned Field will safely
   255  // and explicitly represent `nil` when appropriate.
   256  func Uint64p(key string, val *uint64) Field {
   257  	if val == nil {
   258  		return nilField(key)
   259  	}
   260  	return Uint64(key, *val)
   261  }
   262  
   263  // Uint32 constructs a field with the given key and value.
   264  func Uint32(key string, val uint32) Field {
   265  	return Field{Key: key, Type: zapcore.Uint32Type, Integer: int64(val)}
   266  }
   267  
   268  // Uint32p constructs a field that carries a *uint32. The returned Field will safely
   269  // and explicitly represent `nil` when appropriate.
   270  func Uint32p(key string, val *uint32) Field {
   271  	if val == nil {
   272  		return nilField(key)
   273  	}
   274  	return Uint32(key, *val)
   275  }
   276  
   277  // Uint16 constructs a field with the given key and value.
   278  func Uint16(key string, val uint16) Field {
   279  	return Field{Key: key, Type: zapcore.Uint16Type, Integer: int64(val)}
   280  }
   281  
   282  // Uint16p constructs a field that carries a *uint16. The returned Field will safely
   283  // and explicitly represent `nil` when appropriate.
   284  func Uint16p(key string, val *uint16) Field {
   285  	if val == nil {
   286  		return nilField(key)
   287  	}
   288  	return Uint16(key, *val)
   289  }
   290  
   291  // Uint8 constructs a field with the given key and value.
   292  func Uint8(key string, val uint8) Field {
   293  	return Field{Key: key, Type: zapcore.Uint8Type, Integer: int64(val)}
   294  }
   295  
   296  // Uint8p constructs a field that carries a *uint8. The returned Field will safely
   297  // and explicitly represent `nil` when appropriate.
   298  func Uint8p(key string, val *uint8) Field {
   299  	if val == nil {
   300  		return nilField(key)
   301  	}
   302  	return Uint8(key, *val)
   303  }
   304  
   305  // Uintptr constructs a field with the given key and value.
   306  func Uintptr(key string, val uintptr) Field {
   307  	return Field{Key: key, Type: zapcore.UintptrType, Integer: int64(val)}
   308  }
   309  
   310  // Uintptrp constructs a field that carries a *uintptr. The returned Field will safely
   311  // and explicitly represent `nil` when appropriate.
   312  func Uintptrp(key string, val *uintptr) Field {
   313  	if val == nil {
   314  		return nilField(key)
   315  	}
   316  	return Uintptr(key, *val)
   317  }
   318  
   319  // Reflect constructs a field with the given key and an arbitrary object. It uses
   320  // an encoding-appropriate, reflection-based function to lazily serialize nearly
   321  // any object into the logging context, but it's relatively slow and
   322  // allocation-heavy. Outside tests, Any is always a better choice.
   323  //
   324  // If encoding fails (e.g., trying to serialize a map[int]string to JSON), Reflect
   325  // includes the error message in the final log output.
   326  func Reflect(key string, val interface{}) Field {
   327  	return Field{Key: key, Type: zapcore.ReflectType, Interface: val}
   328  }
   329  
   330  // Namespace creates a named, isolated scope within the logger's context. All
   331  // subsequent fields will be added to the new namespace.
   332  //
   333  // This helps prevent key collisions when injecting loggers into sub-components
   334  // or third-party libraries.
   335  func Namespace(key string) Field {
   336  	return Field{Key: key, Type: zapcore.NamespaceType}
   337  }
   338  
   339  // Stringer constructs a field with the given key and the output of the value's
   340  // String method. The Stringer's String method is called lazily.
   341  func Stringer(key string, val fmt.Stringer) Field {
   342  	return Field{Key: key, Type: zapcore.StringerType, Interface: val}
   343  }
   344  
   345  // Time constructs a Field with the given key and value. The encoder
   346  // controls how the time is serialized.
   347  func Time(key string, val time.Time) Field {
   348  	if val.Before(_minTimeInt64) || val.After(_maxTimeInt64) {
   349  		return Field{Key: key, Type: zapcore.TimeFullType, Interface: val}
   350  	}
   351  	return Field{Key: key, Type: zapcore.TimeType, Integer: val.UnixNano(), Interface: val.Location()}
   352  }
   353  
   354  // Timep constructs a field that carries a *time.Time. The returned Field will safely
   355  // and explicitly represent `nil` when appropriate.
   356  func Timep(key string, val *time.Time) Field {
   357  	if val == nil {
   358  		return nilField(key)
   359  	}
   360  	return Time(key, *val)
   361  }
   362  
   363  // Stack constructs a field that stores a stacktrace of the current goroutine
   364  // under provided key. Keep in mind that taking a stacktrace is eager and
   365  // expensive (relatively speaking); this function both makes an allocation and
   366  // takes about two microseconds.
   367  func Stack(key string) Field {
   368  	return StackSkip(key, 1) // skip Stack
   369  }
   370  
   371  // StackSkip constructs a field similarly to Stack, but also skips the given
   372  // number of frames from the top of the stacktrace.
   373  func StackSkip(key string, skip int) Field {
   374  	// Returning the stacktrace as a string costs an allocation, but saves us
   375  	// from expanding the zapcore.Field union struct to include a byte slice. Since
   376  	// taking a stacktrace is already so expensive (~10us), the extra allocation
   377  	// is okay.
   378  	return String(key, stacktrace.Take(skip+1)) // skip StackSkip
   379  }
   380  
   381  // Duration constructs a field with the given key and value. The encoder
   382  // controls how the duration is serialized.
   383  func Duration(key string, val time.Duration) Field {
   384  	return Field{Key: key, Type: zapcore.DurationType, Integer: int64(val)}
   385  }
   386  
   387  // Durationp constructs a field that carries a *time.Duration. The returned Field will safely
   388  // and explicitly represent `nil` when appropriate.
   389  func Durationp(key string, val *time.Duration) Field {
   390  	if val == nil {
   391  		return nilField(key)
   392  	}
   393  	return Duration(key, *val)
   394  }
   395  
   396  // Object constructs a field with the given key and ObjectMarshaler. It
   397  // provides a flexible, but still type-safe and efficient, way to add map- or
   398  // struct-like user-defined types to the logging context. The struct's
   399  // MarshalLogObject method is called lazily.
   400  func Object(key string, val zapcore.ObjectMarshaler) Field {
   401  	return Field{Key: key, Type: zapcore.ObjectMarshalerType, Interface: val}
   402  }
   403  
   404  // Inline constructs a Field that is similar to Object, but it
   405  // will add the elements of the provided ObjectMarshaler to the
   406  // current namespace.
   407  func Inline(val zapcore.ObjectMarshaler) Field {
   408  	return zapcore.Field{
   409  		Type:      zapcore.InlineMarshalerType,
   410  		Interface: val,
   411  	}
   412  }
   413  
   414  // Dict constructs a field containing the provided key-value pairs.
   415  // It acts similar to [Object], but with the fields specified as arguments.
   416  func Dict(key string, val ...Field) Field {
   417  	return dictField(key, val)
   418  }
   419  
   420  // We need a function with the signature (string, T) for zap.Any.
   421  func dictField(key string, val []Field) Field {
   422  	return Object(key, dictObject(val))
   423  }
   424  
   425  type dictObject []Field
   426  
   427  func (d dictObject) MarshalLogObject(enc zapcore.ObjectEncoder) error {
   428  	for _, f := range d {
   429  		f.AddTo(enc)
   430  	}
   431  	return nil
   432  }
   433  
   434  // We discovered an issue where zap.Any can cause a performance degradation
   435  // when used in new goroutines.
   436  //
   437  // This happens because the compiler assigns 4.8kb (one zap.Field per arm of
   438  // switch statement) of stack space for zap.Any when it takes the form:
   439  //
   440  //	switch v := v.(type) {
   441  //	case string:
   442  //		return String(key, v)
   443  //	case int:
   444  //		return Int(key, v)
   445  //		// ...
   446  //	default:
   447  //		return Reflect(key, v)
   448  //	}
   449  //
   450  // To avoid this, we use the type switch to assign a value to a single local variable
   451  // and then call a function on it.
   452  // The local variable is just a function reference so it doesn't allocate
   453  // when converted to an interface{}.
   454  //
   455  // A fair bit of experimentation went into this.
   456  // See also:
   457  //
   458  // - https://github.com/uber-go/zap/pull/1301
   459  // - https://github.com/uber-go/zap/pull/1303
   460  // - https://github.com/uber-go/zap/pull/1304
   461  // - https://github.com/uber-go/zap/pull/1305
   462  // - https://github.com/uber-go/zap/pull/1308
   463  //
   464  // See https://github.com/golang/go/issues/62077 for upstream issue.
   465  type anyFieldC[T any] func(string, T) Field
   466  
   467  func (f anyFieldC[T]) Any(key string, val any) Field {
   468  	v, _ := val.(T)
   469  	// val is guaranteed to be a T, except when it's nil.
   470  	return f(key, v)
   471  }
   472  
   473  // Any takes a key and an arbitrary value and chooses the best way to represent
   474  // them as a field, falling back to a reflection-based approach only if
   475  // necessary.
   476  //
   477  // Since byte/uint8 and rune/int32 are aliases, Any can't differentiate between
   478  // them. To minimize surprises, []byte values are treated as binary blobs, byte
   479  // values are treated as uint8, and runes are always treated as integers.
   480  func Any(key string, value interface{}) Field {
   481  	var c interface{ Any(string, any) Field }
   482  
   483  	switch value.(type) {
   484  	case zapcore.ObjectMarshaler:
   485  		c = anyFieldC[zapcore.ObjectMarshaler](Object)
   486  	case zapcore.ArrayMarshaler:
   487  		c = anyFieldC[zapcore.ArrayMarshaler](Array)
   488  	case []Field:
   489  		c = anyFieldC[[]Field](dictField)
   490  	case bool:
   491  		c = anyFieldC[bool](Bool)
   492  	case *bool:
   493  		c = anyFieldC[*bool](Boolp)
   494  	case []bool:
   495  		c = anyFieldC[[]bool](Bools)
   496  	case complex128:
   497  		c = anyFieldC[complex128](Complex128)
   498  	case *complex128:
   499  		c = anyFieldC[*complex128](Complex128p)
   500  	case []complex128:
   501  		c = anyFieldC[[]complex128](Complex128s)
   502  	case complex64:
   503  		c = anyFieldC[complex64](Complex64)
   504  	case *complex64:
   505  		c = anyFieldC[*complex64](Complex64p)
   506  	case []complex64:
   507  		c = anyFieldC[[]complex64](Complex64s)
   508  	case float64:
   509  		c = anyFieldC[float64](Float64)
   510  	case *float64:
   511  		c = anyFieldC[*float64](Float64p)
   512  	case []float64:
   513  		c = anyFieldC[[]float64](Float64s)
   514  	case float32:
   515  		c = anyFieldC[float32](Float32)
   516  	case *float32:
   517  		c = anyFieldC[*float32](Float32p)
   518  	case []float32:
   519  		c = anyFieldC[[]float32](Float32s)
   520  	case int:
   521  		c = anyFieldC[int](Int)
   522  	case *int:
   523  		c = anyFieldC[*int](Intp)
   524  	case []int:
   525  		c = anyFieldC[[]int](Ints)
   526  	case int64:
   527  		c = anyFieldC[int64](Int64)
   528  	case *int64:
   529  		c = anyFieldC[*int64](Int64p)
   530  	case []int64:
   531  		c = anyFieldC[[]int64](Int64s)
   532  	case int32:
   533  		c = anyFieldC[int32](Int32)
   534  	case *int32:
   535  		c = anyFieldC[*int32](Int32p)
   536  	case []int32:
   537  		c = anyFieldC[[]int32](Int32s)
   538  	case int16:
   539  		c = anyFieldC[int16](Int16)
   540  	case *int16:
   541  		c = anyFieldC[*int16](Int16p)
   542  	case []int16:
   543  		c = anyFieldC[[]int16](Int16s)
   544  	case int8:
   545  		c = anyFieldC[int8](Int8)
   546  	case *int8:
   547  		c = anyFieldC[*int8](Int8p)
   548  	case []int8:
   549  		c = anyFieldC[[]int8](Int8s)
   550  	case string:
   551  		c = anyFieldC[string](String)
   552  	case *string:
   553  		c = anyFieldC[*string](Stringp)
   554  	case []string:
   555  		c = anyFieldC[[]string](Strings)
   556  	case uint:
   557  		c = anyFieldC[uint](Uint)
   558  	case *uint:
   559  		c = anyFieldC[*uint](Uintp)
   560  	case []uint:
   561  		c = anyFieldC[[]uint](Uints)
   562  	case uint64:
   563  		c = anyFieldC[uint64](Uint64)
   564  	case *uint64:
   565  		c = anyFieldC[*uint64](Uint64p)
   566  	case []uint64:
   567  		c = anyFieldC[[]uint64](Uint64s)
   568  	case uint32:
   569  		c = anyFieldC[uint32](Uint32)
   570  	case *uint32:
   571  		c = anyFieldC[*uint32](Uint32p)
   572  	case []uint32:
   573  		c = anyFieldC[[]uint32](Uint32s)
   574  	case uint16:
   575  		c = anyFieldC[uint16](Uint16)
   576  	case *uint16:
   577  		c = anyFieldC[*uint16](Uint16p)
   578  	case []uint16:
   579  		c = anyFieldC[[]uint16](Uint16s)
   580  	case uint8:
   581  		c = anyFieldC[uint8](Uint8)
   582  	case *uint8:
   583  		c = anyFieldC[*uint8](Uint8p)
   584  	case []byte:
   585  		c = anyFieldC[[]byte](Binary)
   586  	case uintptr:
   587  		c = anyFieldC[uintptr](Uintptr)
   588  	case *uintptr:
   589  		c = anyFieldC[*uintptr](Uintptrp)
   590  	case []uintptr:
   591  		c = anyFieldC[[]uintptr](Uintptrs)
   592  	case time.Time:
   593  		c = anyFieldC[time.Time](Time)
   594  	case *time.Time:
   595  		c = anyFieldC[*time.Time](Timep)
   596  	case []time.Time:
   597  		c = anyFieldC[[]time.Time](Times)
   598  	case time.Duration:
   599  		c = anyFieldC[time.Duration](Duration)
   600  	case *time.Duration:
   601  		c = anyFieldC[*time.Duration](Durationp)
   602  	case []time.Duration:
   603  		c = anyFieldC[[]time.Duration](Durations)
   604  	case error:
   605  		c = anyFieldC[error](NamedError)
   606  	case []error:
   607  		c = anyFieldC[[]error](Errors)
   608  	case fmt.Stringer:
   609  		c = anyFieldC[fmt.Stringer](Stringer)
   610  	default:
   611  		c = anyFieldC[any](Reflect)
   612  	}
   613  
   614  	return c.Any(key, value)
   615  }
   616  

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