diff --git a/ext/include/doc.go b/ext/include/doc.go
deleted file mode 100644
index 11ea07d..0000000
--- a/ext/include/doc.go
+++ /dev/null
@@ -1,12 +0,0 @@
-// Package include implements a HCL extension that allows inclusion of
-// one HCL body into another using blocks of type "include", with the following
-// structure:
-//
-//     include {
-//       path = "./foo.hcl"
-//     }
-//
-// The processing of the given path is delegated to the calling application,
-// allowing it to decide how to interpret the path and which syntaxes to
-// support for referenced files.
-package include
diff --git a/ext/include/file_resolver.go b/ext/include/file_resolver.go
deleted file mode 100644
index 11091b8..0000000
--- a/ext/include/file_resolver.go
+++ /dev/null
@@ -1,52 +0,0 @@
-package include
-
-import (
-	"path/filepath"
-	"strings"
-
-	"github.com/hashicorp/hcl/v2"
-	"github.com/hashicorp/hcl/v2/hclparse"
-)
-
-// FileResolver creates and returns a Resolver that interprets include paths
-// as filesystem paths relative to the calling configuration file.
-//
-// When an include is requested, the source filename of the calling config
-// file is first interpreted relative to the given basePath, and then the
-// path given in configuration is interpreted relative to the resulting
-// absolute caller configuration directory.
-//
-// This resolver assumes that all calling bodies are loaded from local files
-// and that the paths to these files were correctly provided to the parser,
-// either absolute or relative to the given basePath.
-//
-// If the path given in configuration ends with ".json" then the referenced
-// file is interpreted as JSON. Otherwise, it is interpreted as HCL native
-// syntax.
-func FileResolver(baseDir string, parser *hclparse.Parser) Resolver {
-	return &fileResolver{
-		BaseDir: baseDir,
-		Parser:  parser,
-	}
-}
-
-type fileResolver struct {
-	BaseDir string
-	Parser  *hclparse.Parser
-}
-
-func (r fileResolver) ResolveBodyPath(path string, refRange hcl.Range) (hcl.Body, hcl.Diagnostics) {
-	callerFile := filepath.Join(r.BaseDir, refRange.Filename)
-	callerDir := filepath.Dir(callerFile)
-	targetFile := filepath.Join(callerDir, path)
-
-	var f *hcl.File
-	var diags hcl.Diagnostics
-	if strings.HasSuffix(targetFile, ".json") {
-		f, diags = r.Parser.ParseJSONFile(targetFile)
-	} else {
-		f, diags = r.Parser.ParseHCLFile(targetFile)
-	}
-
-	return f.Body, diags
-}
diff --git a/ext/include/map_resolver.go b/ext/include/map_resolver.go
deleted file mode 100644
index 452a6d8..0000000
--- a/ext/include/map_resolver.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package include
-
-import (
-	"fmt"
-
-	"github.com/hashicorp/hcl/v2"
-)
-
-// MapResolver returns a Resolver that consults the given map for preloaded
-// bodies (the values) associated with static include paths (the keys).
-//
-// An error diagnostic is returned if a path is requested that does not appear
-// as a key in the given map.
-func MapResolver(m map[string]hcl.Body) Resolver {
-	return ResolverFunc(func(path string, refRange hcl.Range) (hcl.Body, hcl.Diagnostics) {
-		if body, ok := m[path]; ok {
-			return body, nil
-		}
-
-		return nil, hcl.Diagnostics{
-			{
-				Severity: hcl.DiagError,
-				Summary:  "Invalid include path",
-				Detail:   fmt.Sprintf("The include path %q is not recognized.", path),
-				Subject:  &refRange,
-			},
-		}
-	})
-}
diff --git a/ext/include/resolver.go b/ext/include/resolver.go
deleted file mode 100644
index 38c8b73..0000000
--- a/ext/include/resolver.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package include
-
-import (
-	"github.com/hashicorp/hcl/v2"
-)
-
-// A Resolver maps an include path (an arbitrary string, but usually something
-// filepath-like) to a hcl.Body.
-//
-// The parameter "refRange" is the source range of the expression in the calling
-// body that provided the given path, for use in generating "invalid path"-type
-// diagnostics.
-//
-// If the returned body is nil, it will be ignored.
-//
-// Any returned diagnostics will be emitted when content is requested from the
-// final composed body (after all includes have been dealt with).
-type Resolver interface {
-	ResolveBodyPath(path string, refRange hcl.Range) (hcl.Body, hcl.Diagnostics)
-}
-
-// ResolverFunc is a function type that implements Resolver.
-type ResolverFunc func(path string, refRange hcl.Range) (hcl.Body, hcl.Diagnostics)
-
-// ResolveBodyPath is an implementation of Resolver.ResolveBodyPath.
-func (f ResolverFunc) ResolveBodyPath(path string, refRange hcl.Range) (hcl.Body, hcl.Diagnostics) {
-	return f(path, refRange)
-}
diff --git a/ext/include/transformer.go b/ext/include/transformer.go
deleted file mode 100644
index ae0a808..0000000
--- a/ext/include/transformer.go
+++ /dev/null
@@ -1,92 +0,0 @@
-package include
-
-import (
-	"github.com/hashicorp/hcl/v2/ext/transform"
-	"github.com/hashicorp/hcl/v2/gohcl"
-	"github.com/hashicorp/hcl/v2"
-)
-
-// Transformer builds a transformer that finds any "include" blocks in a body
-// and produces a merged body that contains the original content plus the
-// content of the other bodies referenced by the include blocks.
-//
-// blockType specifies the type of block to interpret. The conventional type name
-// is "include".
-//
-// ctx provides an evaluation context for the path expressions in include blocks.
-// If nil, path expressions may not reference variables nor functions.
-//
-// The given resolver is used to translate path strings (after expression
-// evaluation) into bodies. FileResolver returns a reasonable implementation for
-// applications that read configuration files from local disk.
-//
-// The returned Transformer can either be used directly to process includes
-// in a shallow fashion on a single body, or it can be used with
-// transform.Deep (from the sibling transform package) to allow includes
-// at all levels of a nested block structure:
-//
-//    transformer = include.Transformer("include", nil, include.FileResolver(".", parser))
-//    body = transform.Deep(body, transformer)
-//    // "body" will now have includes resolved in its own content and that
-//    // of any descendent blocks.
-//
-func Transformer(blockType string, ctx *hcl.EvalContext, resolver Resolver) transform.Transformer {
-	return &transformer{
-		Schema: &hcl.BodySchema{
-			Blocks: []hcl.BlockHeaderSchema{
-				{
-					Type: blockType,
-				},
-			},
-		},
-		Ctx:      ctx,
-		Resolver: resolver,
-	}
-}
-
-type transformer struct {
-	Schema   *hcl.BodySchema
-	Ctx      *hcl.EvalContext
-	Resolver Resolver
-}
-
-func (t *transformer) TransformBody(in hcl.Body) hcl.Body {
-	content, remain, diags := in.PartialContent(t.Schema)
-
-	if content == nil || len(content.Blocks) == 0 {
-		// Nothing to do!
-		return transform.BodyWithDiagnostics(remain, diags)
-	}
-
-	bodies := make([]hcl.Body, 1, len(content.Blocks)+1)
-	bodies[0] = remain // content in "remain" takes priority over includes
-	for _, block := range content.Blocks {
-		incContent, incDiags := block.Body.Content(includeBlockSchema)
-		diags = append(diags, incDiags...)
-		if incDiags.HasErrors() {
-			continue
-		}
-
-		pathExpr := incContent.Attributes["path"].Expr
-		var path string
-		incDiags = gohcl.DecodeExpression(pathExpr, t.Ctx, &path)
-		diags = append(diags, incDiags...)
-		if incDiags.HasErrors() {
-			continue
-		}
-
-		incBody, incDiags := t.Resolver.ResolveBodyPath(path, pathExpr.Range())
-		bodies = append(bodies, transform.BodyWithDiagnostics(incBody, incDiags))
-	}
-
-	return hcl.MergeBodies(bodies)
-}
-
-var includeBlockSchema = &hcl.BodySchema{
-	Attributes: []hcl.AttributeSchema{
-		{
-			Name:     "path",
-			Required: true,
-		},
-	},
-}
diff --git a/ext/include/transformer_test.go b/ext/include/transformer_test.go
deleted file mode 100644
index e5d6c1a..0000000
--- a/ext/include/transformer_test.go
+++ /dev/null
@@ -1,112 +0,0 @@
-package include
-
-import (
-	"reflect"
-	"testing"
-
-	"github.com/davecgh/go-spew/spew"
-	"github.com/hashicorp/hcl/v2/gohcl"
-	"github.com/hashicorp/hcl/v2"
-	"github.com/hashicorp/hcl/v2/hcltest"
-	"github.com/zclconf/go-cty/cty"
-)
-
-func TestTransformer(t *testing.T) {
-	caller := hcltest.MockBody(&hcl.BodyContent{
-		Blocks: hcl.Blocks{
-			{
-				Type: "include",
-				Body: hcltest.MockBody(&hcl.BodyContent{
-					Attributes: hcltest.MockAttrs(map[string]hcl.Expression{
-						"path": hcltest.MockExprVariable("var_path"),
-					}),
-				}),
-			},
-			{
-				Type: "include",
-				Body: hcltest.MockBody(&hcl.BodyContent{
-					Attributes: hcltest.MockAttrs(map[string]hcl.Expression{
-						"path": hcltest.MockExprLiteral(cty.StringVal("include2")),
-					}),
-				}),
-			},
-			{
-				Type: "foo",
-				Body: hcltest.MockBody(&hcl.BodyContent{
-					Attributes: hcltest.MockAttrs(map[string]hcl.Expression{
-						"from": hcltest.MockExprLiteral(cty.StringVal("caller")),
-					}),
-				}),
-			},
-		},
-	})
-
-	resolver := MapResolver(map[string]hcl.Body{
-		"include1": hcltest.MockBody(&hcl.BodyContent{
-			Blocks: hcl.Blocks{
-				{
-					Type: "foo",
-					Body: hcltest.MockBody(&hcl.BodyContent{
-						Attributes: hcltest.MockAttrs(map[string]hcl.Expression{
-							"from": hcltest.MockExprLiteral(cty.StringVal("include1")),
-						}),
-					}),
-				},
-			},
-		}),
-		"include2": hcltest.MockBody(&hcl.BodyContent{
-			Blocks: hcl.Blocks{
-				{
-					Type: "foo",
-					Body: hcltest.MockBody(&hcl.BodyContent{
-						Attributes: hcltest.MockAttrs(map[string]hcl.Expression{
-							"from": hcltest.MockExprLiteral(cty.StringVal("include2")),
-						}),
-					}),
-				},
-			},
-		}),
-	})
-
-	ctx := &hcl.EvalContext{
-		Variables: map[string]cty.Value{
-			"var_path": cty.StringVal("include1"),
-		},
-	}
-
-	transformer := Transformer("include", ctx, resolver)
-	merged := transformer.TransformBody(caller)
-
-	type foo struct {
-		From string `hcl:"from,attr"`
-	}
-	type result struct {
-		Foos []foo `hcl:"foo,block"`
-	}
-	var got result
-	diags := gohcl.DecodeBody(merged, nil, &got)
-	if len(diags) != 0 {
-		t.Errorf("unexpected diags")
-		for _, diag := range diags {
-			t.Logf("- %s", diag)
-		}
-	}
-
-	want := result{
-		Foos: []foo{
-			{
-				From: "caller",
-			},
-			{
-				From: "include1",
-			},
-			{
-				From: "include2",
-			},
-		},
-	}
-
-	if !reflect.DeepEqual(got, want) {
-		t.Errorf("wrong result\ngot: %swant: %s", spew.Sdump(got), spew.Sdump(want))
-	}
-}