misc: more stdlib stubs to allow compilation

src/reflect/type.go

@@ -529,3 +529,7 @@ func FuncOf(in, out []Type, variadic bool) Type {
 
 	return toType(reflectlite.FuncOf(rawIn, rawOut, variadic))
 }
+
+func ChanOf(dir ChanDir, t Type) Type {
+	panic("unimplemented: reflect.ChanOf")
+}

src/reflect/value.go

@@ -178,6 +178,10 @@ func (v Value) Send(x Value) {
 	panic("unimplemented: reflect.Value.Send()")
 }
 
+func (v Value) TrySend(x Value) bool {
+	panic("unimplemented: reflect.Value.TrySend()")
+}
+
 func (v Value) Close() {
 	panic("unimplemented: reflect.Value.Close()")
 }
@@ -217,6 +221,10 @@ func (v Value) Recv() (x Value, ok bool) {
 	panic("unimplemented: (reflect.Value).Recv()")
 }
 
+func (v Value) TryRecv() (x Value, ok bool) {
+	panic("unimplemented: (reflect.Value).TryRecv()")
+}
+
 func NewAt(typ Type, p unsafe.Pointer) Value {
 	panic("unimplemented: reflect.New()")
 }

src/runtime/debug/garbage.go

@@ -0,0 +1,37 @@
+// Package debug is a very partially implemented package to allow compilation.
+package debug
+
+import (
+	"time"
+)
+
+type GCStats struct {
+	LastGC         time.Time
+	NumGC          int64
+	PauseTotal     time.Duration
+	Pause          []time.Duration
+	PauseEnd       []time.Time
+	PauseQuantiles []time.Duration
+}
+
+func ReadGCStats(stats *GCStats) {
+}
+
+func FreeOSMemory() {
+}
+
+func SetMaxThreads(threads int) int {
+	return threads
+}
+
+func SetPanicOnFault(enabled bool) bool {
+	return enabled
+}
+
+func WriteHeapDump(fd uintptr)
+
+func SetTraceback(level string)
+
+func SetMemoryLimit(limit int64) int64 {
+	return limit
+}

src/runtime/metrics/metrics.go

@@ -2,15 +2,26 @@
 
 package metrics
 
-type Description struct{}
+type Description struct {
+	Name        string
+	Description string
+	Kind        ValueKind
+	Cumulative  bool
+}
 
 func All() []Description {
 	return nil
 }
 
-type Float64Histogram struct{}
+type Float64Histogram struct {
+	Counts  []uint64
+	Buckets []float64
+}
 
-type Sample struct{}
+type Sample struct {
+	Name  string
+	Value Value
+}
 
 func Read(m []Sample) {}
 
@@ -23,10 +34,17 @@ func (v Value) Float64Histogram() *Float64Histogram {
 	return nil
 }
 func (v Value) Kind() ValueKind {
-	return ValueKind{}
+	return KindBad
 }
 func (v Value) Uint64() uint64 {
 	return 0
 }
 
-type ValueKind struct{}
+type ValueKind int
+
+const (
+	KindBad ValueKind = iota
+	KindUint64
+	KindFloat64
+	KindFloat64Histogram
+)