diff --git a/internal/lsp/cache/file.go b/internal/lsp/cache/file.go
index cded8720..1a12a383 100644
--- a/internal/lsp/cache/file.go
+++ b/internal/lsp/cache/file.go
@@ -5,7 +5,6 @@
 package cache
 
 import (
-	"fmt"
 	"go/ast"
 	"go/token"
 	"io/ioutil"
@@ -32,53 +31,41 @@ func (f *File) Read() ([]byte, error) {
 	return f.read()
 }
 
-func (f *File) GetFileSet() (*token.FileSet, error) {
-	if f.view.Config.Fset == nil {
-		return nil, fmt.Errorf("no fileset for file view config")
-	}
-	return f.view.Config.Fset, nil
+func (f *File) GetFileSet() *token.FileSet {
+	return f.view.Config.Fset
 }
 
-func (f *File) GetToken() (*token.File, error) {
+func (f *File) GetToken() *token.File {
 	f.view.mu.Lock()
 	defer f.view.mu.Unlock()
 	if f.token == nil {
 		if err := f.view.parse(f.URI); err != nil {
-			return nil, err
-		}
-		if f.token == nil {
-			return nil, fmt.Errorf("failed to find or parse %v", f.URI)
+			return nil
 		}
 	}
-	return f.token, nil
+	return f.token
 }
 
-func (f *File) GetAST() (*ast.File, error) {
+func (f *File) GetAST() *ast.File {
 	f.view.mu.Lock()
 	defer f.view.mu.Unlock()
 	if f.ast == nil {
 		if err := f.view.parse(f.URI); err != nil {
-			return nil, err
-		}
-		if f.ast == nil {
-			return nil, fmt.Errorf("failed to find or parse %v", f.URI)
+			return nil
 		}
 	}
-	return f.ast, nil
+	return f.ast
 }
 
-func (f *File) GetPackage() (*packages.Package, error) {
+func (f *File) GetPackage() *packages.Package {
 	f.view.mu.Lock()
 	defer f.view.mu.Unlock()
 	if f.pkg == nil {
 		if err := f.view.parse(f.URI); err != nil {
-			return nil, err
-		}
-		if f.pkg == nil {
-			return nil, fmt.Errorf("failed to find or parse %v", f.URI)
+			return nil
 		}
 	}
-	return f.pkg, nil
+	return f.pkg
 }
 
 // read is the internal part of Read that presumes the lock is already held
diff --git a/internal/lsp/cmd/definition.go b/internal/lsp/cmd/definition.go
index 861de838..29202e88 100644
--- a/internal/lsp/cmd/definition.go
+++ b/internal/lsp/cmd/definition.go
@@ -65,10 +65,7 @@ func (d *definition) Run(ctx context.Context, args ...string) error {
 	if err != nil {
 		return err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return err
-	}
+	tok := f.GetToken()
 	pos := tok.Pos(from.Start.Offset)
 	ident, err := source.Identifier(ctx, view, f, pos)
 	if err != nil {
@@ -118,10 +115,7 @@ func buildDefinition(view source.View, ident *source.IdentifierInfo) (*Definitio
 
 func buildGuruDefinition(view source.View, ident *source.IdentifierInfo) (*guru.Definition, error) {
 	loc := newLocation(view.FileSet(), ident.Declaration.Range)
-	pkg, err := ident.File.GetPackage()
-	if err != nil {
-		return nil, err
-	}
+	pkg := ident.File.GetPackage()
 	// guru does not support ranges
 	loc.End = loc.Start
 	// Behavior that attempts to match the expected output for guru. For an example
diff --git a/internal/lsp/format.go b/internal/lsp/format.go
index ec0db161..650f72e1 100644
--- a/internal/lsp/format.go
+++ b/internal/lsp/format.go
@@ -18,10 +18,7 @@ func formatRange(ctx context.Context, v source.View, uri protocol.DocumentURI, r
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	var r source.Range
 	if rng == nil {
 		r.Start = tok.Pos(0)
diff --git a/internal/lsp/imports.go b/internal/lsp/imports.go
index 2f8f7c1c..3b57db3b 100644
--- a/internal/lsp/imports.go
+++ b/internal/lsp/imports.go
@@ -20,10 +20,7 @@ func organizeImports(ctx context.Context, v source.View, uri protocol.DocumentUR
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	r := source.Range{
 		Start: tok.Pos(0),
 		End:   tok.Pos(tok.Size()),
diff --git a/internal/lsp/position.go b/internal/lsp/position.go
index 4b19c784..fb0d9bdb 100644
--- a/internal/lsp/position.go
+++ b/internal/lsp/position.go
@@ -36,10 +36,7 @@ func fromProtocolLocation(ctx context.Context, v *cache.View, loc protocol.Locat
 	if err != nil {
 		return source.Range{}, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return source.Range{}, err
-	}
+	tok := f.GetToken()
 	return fromProtocolRange(tok, loc.Range), nil
 }
 
diff --git a/internal/lsp/server.go b/internal/lsp/server.go
index 46d03e6e..3db22fff 100644
--- a/internal/lsp/server.go
+++ b/internal/lsp/server.go
@@ -220,10 +220,7 @@ func (s *server) Completion(ctx context.Context, params *protocol.CompletionPara
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	pos := fromProtocolPosition(tok, params.Position)
 	items, prefix, err := source.Completion(ctx, f, pos)
 	if err != nil {
@@ -248,10 +245,7 @@ func (s *server) Hover(ctx context.Context, params *protocol.TextDocumentPositio
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	pos := fromProtocolPosition(tok, params.Position)
 	ident, err := source.Identifier(ctx, s.view, f, pos)
 	if err != nil {
@@ -280,10 +274,7 @@ func (s *server) SignatureHelp(ctx context.Context, params *protocol.TextDocumen
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	pos := fromProtocolPosition(tok, params.Position)
 	info, err := source.SignatureHelp(ctx, f, pos)
 	if err != nil {
@@ -301,10 +292,7 @@ func (s *server) Definition(ctx context.Context, params *protocol.TextDocumentPo
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	pos := fromProtocolPosition(tok, params.Position)
 	ident, err := source.Identifier(ctx, s.view, f, pos)
 	if err != nil {
@@ -322,10 +310,7 @@ func (s *server) TypeDefinition(ctx context.Context, params *protocol.TextDocume
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	pos := fromProtocolPosition(tok, params.Position)
 	ident, err := source.Identifier(ctx, s.view, f, pos)
 	if err != nil {
diff --git a/internal/lsp/source/completion.go b/internal/lsp/source/completion.go
index a748a175..a6799ad2 100644
--- a/internal/lsp/source/completion.go
+++ b/internal/lsp/source/completion.go
@@ -47,14 +47,8 @@ type finder func(types.Object, float64, []CompletionItem) []CompletionItem
 // completion. For instance, some clients may tolerate imperfect matches as
 // valid completion results, since users may make typos.
 func Completion(ctx context.Context, f File, pos token.Pos) (items []CompletionItem, prefix string, err error) {
-	file, err := f.GetAST()
-	if err != nil {
-		return nil, "", err
-	}
-	pkg, err := f.GetPackage()
-	if err != nil {
-		return nil, "", err
-	}
+	file := f.GetAST()
+	pkg := f.GetPackage()
 	path, _ := astutil.PathEnclosingInterval(file, pos, pos)
 	if path == nil {
 		return nil, "", fmt.Errorf("cannot find node enclosing position")
diff --git a/internal/lsp/source/definition.go b/internal/lsp/source/definition.go
index bac247be..bc233c0c 100644
--- a/internal/lsp/source/definition.go
+++ b/internal/lsp/source/definition.go
@@ -50,14 +50,8 @@ func Identifier(ctx context.Context, v View, f File, pos token.Pos) (*Identifier
 
 func (i *IdentifierInfo) Hover(q types.Qualifier) (string, error) {
 	if q == nil {
-		fAST, err := i.File.GetAST()
-		if err != nil {
-			return "", err
-		}
-		pkg, err := i.File.GetPackage()
-		if err != nil {
-			return "", err
-		}
+		fAST := i.File.GetAST()
+		pkg := i.File.GetPackage()
 		q = qualifier(fAST, pkg.Types, pkg.TypesInfo)
 	}
 	return types.ObjectString(i.Declaration.Object, q), nil
@@ -65,14 +59,8 @@ func (i *IdentifierInfo) Hover(q types.Qualifier) (string, error) {
 
 // identifier checks a single position for a potential identifier.
 func identifier(ctx context.Context, v View, f File, pos token.Pos) (*IdentifierInfo, error) {
-	fAST, err := f.GetAST()
-	if err != nil {
-		return nil, err
-	}
-	pkg, err := f.GetPackage()
-	if err != nil {
-		return nil, err
-	}
+	fAST := f.GetAST()
+	pkg := f.GetPackage()
 	path, _ := astutil.PathEnclosingInterval(fAST, pos, pos)
 	result := &IdentifierInfo{
 		File: f,
@@ -109,6 +97,7 @@ func identifier(ctx context.Context, v View, f File, pos token.Pos) (*Identifier
 			}
 		}
 	}
+	var err error
 	if result.Declaration.Range, err = objToRange(ctx, v, result.Declaration.Object); err != nil {
 		return nil, err
 	}
diff --git a/internal/lsp/source/diagnostics.go b/internal/lsp/source/diagnostics.go
index 27f5bad2..9fa26b7a 100644
--- a/internal/lsp/source/diagnostics.go
+++ b/internal/lsp/source/diagnostics.go
@@ -50,10 +50,7 @@ func Diagnostics(ctx context.Context, v View, uri URI) (map[string][]Diagnostic,
 	if err != nil {
 		return nil, err
 	}
-	pkg, err := f.GetPackage()
-	if err != nil {
-		return nil, err
-	}
+	pkg := f.GetPackage()
 	// Prepare the reports we will send for this package.
 	reports := make(map[string][]Diagnostic)
 	for _, filename := range pkg.GoFiles {
@@ -82,10 +79,7 @@ func Diagnostics(ctx context.Context, v View, uri URI) (map[string][]Diagnostic,
 		if err != nil {
 			continue
 		}
-		diagTok, err := diagFile.GetToken()
-		if err != nil {
-			continue
-		}
+		diagTok := diagFile.GetToken()
 		content, err := diagFile.Read()
 		if err != nil {
 			continue
diff --git a/internal/lsp/source/format.go b/internal/lsp/source/format.go
index 78aaab71..ac5a304c 100644
--- a/internal/lsp/source/format.go
+++ b/internal/lsp/source/format.go
@@ -21,10 +21,7 @@ import (
 
 // Format formats a file with a given range.
 func Format(ctx context.Context, f File, rng Range) ([]TextEdit, error) {
-	fAST, err := f.GetAST()
-	if err != nil {
-		return nil, err
-	}
+	fAST := f.GetAST()
 	path, exact := astutil.PathEnclosingInterval(fAST, rng.Start, rng.End)
 	if !exact || len(path) == 0 {
 		return nil, fmt.Errorf("no exact AST node matching the specified range")
@@ -50,10 +47,7 @@ func Format(ctx context.Context, f File, rng Range) ([]TextEdit, error) {
 	// of Go used to build the LSP server will determine how it formats code.
 	// This should be acceptable for all users, who likely be prompted to rebuild
 	// the LSP server on each Go release.
-	fset, err := f.GetFileSet()
-	if err != nil {
-		return nil, err
-	}
+	fset := f.GetFileSet()
 	buf := &bytes.Buffer{}
 	if err := format.Node(buf, fset, node); err != nil {
 		return nil, err
@@ -62,10 +56,7 @@ func Format(ctx context.Context, f File, rng Range) ([]TextEdit, error) {
 	if err != nil {
 		return nil, err
 	}
-	tok, err := f.GetToken()
-	if err != nil {
-		return nil, err
-	}
+	tok := f.GetToken()
 	return computeTextEdits(rng, tok, string(content), buf.String()), nil
 }
 
diff --git a/internal/lsp/source/signature_help.go b/internal/lsp/source/signature_help.go
index db78b126..4478fed2 100644
--- a/internal/lsp/source/signature_help.go
+++ b/internal/lsp/source/signature_help.go
@@ -25,14 +25,8 @@ type ParameterInformation struct {
 }
 
 func SignatureHelp(ctx context.Context, f File, pos token.Pos) (*SignatureInformation, error) {
-	fAST, err := f.GetAST()
-	if err != nil {
-		return nil, err
-	}
-	pkg, err := f.GetPackage()
-	if err != nil {
-		return nil, err
-	}
+	fAST := f.GetAST()
+	pkg := f.GetPackage()
 
 	// Find a call expression surrounding the query position.
 	var callExpr *ast.CallExpr
diff --git a/internal/lsp/source/view.go b/internal/lsp/source/view.go
index 49538270..eaac87dd 100644
--- a/internal/lsp/source/view.go
+++ b/internal/lsp/source/view.go
@@ -27,10 +27,10 @@ type View interface {
 // building blocks for most queries. Users of the source package can abstract
 // the loading of packages into their own caching systems.
 type File interface {
-	GetAST() (*ast.File, error)
-	GetFileSet() (*token.FileSet, error)
-	GetPackage() (*packages.Package, error)
-	GetToken() (*token.File, error)
+	GetAST() *ast.File
+	GetFileSet() *token.FileSet
+	GetPackage() *packages.Package
+	GetToken() *token.File
 	Read() ([]byte, error)
 }