stack: Drop FromError

That was a bit of a failed experiment. Oh well.

callstack/stack.go

@@ -1,7 +1,6 @@
 package callstack
 
 import (
-	"errors"
 	"fmt"
 	"iter"
 	"runtime"
@@ -36,26 +35,6 @@ func GetSkip(skip int) Stack {
 	}
 }
 
-// FromError attempts to get a [Stack] that's embedded into an error. It returns
-// the first [Stack] found.
-func FromError(err error) (st Stack, found bool) {
-	for err != nil {
-		if getter, ok := err.(interface{ get() Stack }); ok {
-			st = getter.get()
-			found = true
-			return
-		}
-
-		err = errors.Unwrap(err)
-	}
-
-	return
-}
-
-func (st Stack) get() Stack {
-	return st
-}
-
 // A shallow wrapper around [runtime.CallersFrames]
 func (st Stack) CallersFrames() *runtime.Frames {
 	return runtime.CallersFrames(st.s)

callstack/stack_test.go

@@ -1,8 +1,6 @@
 package callstack
 
 import (
-	"errors"
-	"fmt"
 	"reflect"
 	"strings"
 	"testing"
@@ -38,32 +36,6 @@ func TestGet(t *testing.T) {
 	c.Equal(frames[depth].Function, funcName)
 }
 
-func TestFromError(t *testing.T) {
-	c := check.NewT(t)
-
-	type embed struct {
-		Stack
-		error
-	}
-
-	deep := embed{
-		Stack: Get(),
-		error: errors.New("test"),
-	}
-
-	err := fmt.Errorf("%s: %w", "wrap", deep)
-	for range 5 {
-		st, found := FromError(err)
-		c.True(found)
-		c.Equal(deep.Stack, st)
-
-		err = fmt.Errorf("%s: %w", "wrap", deep)
-	}
-
-	_, found := FromError(errors.New("merp"))
-	c.False(found)
-}
-
 func TestStackIters(t *testing.T) {
 	recurse(10, func() any {
 		for _ = range Get().All() {