diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index 9c5f2238c6a..5d7a36dfe25 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -453,7 +453,7 @@ export interface CompletionItem {
 	 * *Note:* The range must be a [single line](#Range.isSingleLine) and it must
 	 * [contain](#Range.contains) the position at which completion has been [requested](#CompletionItemProvider.provideCompletionItems).
 	 */
-	range: IRange;
+	range: IRange | { insert: IRange, replace: IRange };
 	/**
 	 * An optional set of characters that when pressed while this completion is active will accept it first and
 	 * then type that character. *Note* that all commit characters should have `length=1` and that superfluous
diff --git a/src/vs/editor/contrib/suggest/completionModel.ts b/src/vs/editor/contrib/suggest/completionModel.ts
index f1bbdb462f7..c1349fa7935 100644
--- a/src/vs/editor/contrib/suggest/completionModel.ts
+++ b/src/vs/editor/contrib/suggest/completionModel.ts
@@ -160,7 +160,7 @@ export class CompletionModel {
 			// 'word' is that remainder of the current line that we
 			// filter and score against. In theory each suggestion uses a
 			// different word, but in practice not - that's why we cache
-			const overwriteBefore = item.position.column - item.completion.range.startColumn;
+			const overwriteBefore = item.position.column - item.editStart.column;
 			const wordLen = overwriteBefore + characterCountDelta - (item.position.column - this._column);
 			if (word.length !== wordLen) {
 				word = wordLen === 0 ? '' : leadingLineContent.slice(-wordLen);
diff --git a/src/vs/editor/contrib/suggest/suggest.ts b/src/vs/editor/contrib/suggest/suggest.ts
index 09f1b9a4d06..d28423e1602 100644
--- a/src/vs/editor/contrib/suggest/suggest.ts
+++ b/src/vs/editor/contrib/suggest/suggest.ts
@@ -31,6 +31,11 @@ export class CompletionItem {
 
 	readonly resolve: (token: CancellationToken) => Promise<void>;
 
+	//
+	readonly editStart: IPosition;
+	readonly editInsertEnd: IPosition;
+	readonly editReplaceEnd: IPosition;
+
 	// perf
 	readonly labelLow: string;
 	readonly sortTextLow?: string;
@@ -54,6 +59,17 @@ export class CompletionItem {
 		this.sortTextLow = completion.sortText && completion.sortText.toLowerCase();
 		this.filterTextLow = completion.filterText && completion.filterText.toLowerCase();
 
+		// normalize ranges
+		if (Range.isIRange(completion.range)) {
+			this.editStart = new Position(completion.range.startLineNumber, completion.range.startColumn);
+			this.editInsertEnd = new Position(completion.range.endLineNumber, completion.range.endColumn);
+			this.editReplaceEnd = new Position(completion.range.endLineNumber, completion.range.endColumn);
+		} else {
+			this.editStart = new Position(completion.range.insert.startLineNumber, completion.range.insert.startColumn);
+			this.editInsertEnd = new Position(completion.range.insert.endLineNumber, completion.range.insert.endColumn);
+			this.editReplaceEnd = new Position(completion.range.replace.endLineNumber, completion.range.replace.endColumn);
+		}
+
 		// create the suggestion resolver
 		const { resolveCompletionItem } = provider;
 		if (typeof resolveCompletionItem !== 'function') {
@@ -122,8 +138,12 @@ export function provideSuggestionItems(
 	token: CancellationToken = CancellationToken.None
 ): Promise<CompletionItem[]> {
 
-	const wordUntil = model.getWordUntilPosition(position);
-	const defaultRange = new Range(position.lineNumber, wordUntil.startColumn, position.lineNumber, wordUntil.endColumn);
+	const word = model.getWordAtPosition(position);
+	const defaultReplaceRange = word ? new Range(position.lineNumber, word.startColumn, position.lineNumber, word.endColumn) : Range.fromPositions(position);
+	const defaultInsertRange = defaultReplaceRange.setEndPosition(position.lineNumber, position.column);
+
+	// const wordUntil = model.getWordUntilPosition(position);
+	// const defaultRange = new Range(position.lineNumber, wordUntil.startColumn, position.lineNumber, wordUntil.endColumn);
 
 	position = position.clone();
 
@@ -159,7 +179,7 @@ export function provideSuggestionItems(
 
 							// fill in default range when missing
 							if (!suggestion.range) {
-								suggestion.range = defaultRange;
+								suggestion.range = { insert: defaultInsertRange, replace: defaultReplaceRange };
 							}
 							// fill in default sortText when missing
 							if (!suggestion.sortText) {
diff --git a/src/vs/editor/contrib/suggest/suggestController.ts b/src/vs/editor/contrib/suggest/suggestController.ts
index c173302a30d..007b89d7203 100644
--- a/src/vs/editor/contrib/suggest/suggestController.ts
+++ b/src/vs/editor/contrib/suggest/suggestController.ts
@@ -138,7 +138,7 @@ export class SuggestController implements IEditorContribution {
 			this._toDispose.add(widget.onDidFocus(({ item }) => {
 
 				const position = this._editor.getPosition()!;
-				const startColumn = item.completion.range.startColumn;
+				const startColumn = item.editStart.column;
 				const endColumn = position.column;
 				let value = true;
 				if (
@@ -241,7 +241,8 @@ export class SuggestController implements IEditorContribution {
 
 		const model = this._editor.getModel();
 		const modelVersionNow = model.getAlternativeVersionId();
-		const { completion: suggestion, position } = event.item;
+		const { item } = event;
+		const { completion: suggestion, position } = item;
 		const columnDelta = this._editor.getPosition().column - position.column;
 
 		// pushing undo stops *before* additional text edits and
@@ -255,33 +256,20 @@ export class SuggestController implements IEditorContribution {
 		}
 
 		// keep item in memory
-		this._memoryService.memorize(model, this._editor.getPosition(), event.item);
+		this._memoryService.memorize(model, this._editor.getPosition(), item);
 
 		let { insertText } = suggestion;
 		if (!(suggestion.insertTextRules! & CompletionItemInsertTextRule.InsertAsSnippet)) {
 			insertText = SnippetParser.escape(insertText);
 		}
 
-		let overwriteBefore = position.column - suggestion.range.startColumn;
-		let overwriteAfter = suggestion.range.endColumn - position.column;
-		let suffixDelta = this._lineSuffix.value ? this._lineSuffix.value.delta(this._editor.getPosition()) : 0;
-		let word = model.getWordAtPosition(this._editor.getPosition());
-
 		const overwriteConfig = flags & InsertFlags.AlternativeOverwriteConfig
 			? !this._editor.getOption(EditorOption.suggest).overwriteOnAccept
 			: this._editor.getOption(EditorOption.suggest).overwriteOnAccept;
-		if (!overwriteConfig) {
-			if (overwriteAfter > 0 && word && suggestion.range.endColumn === word.endColumn) {
-				// don't overwrite anything right of the cursor, overrule extension even when the
-				// completion only replaces a word...
-				overwriteAfter = 0;
-			}
-		} else {
-			if (overwriteAfter === 0 && word) {
-				// compute fallback overwrite length
-				overwriteAfter = word.endColumn - this._editor.getPosition().column;
-			}
-		}
+
+		const overwriteBefore = position.column - item.editStart.column;
+		const overwriteAfter = (overwriteConfig ? item.editReplaceEnd.column : item.editInsertEnd.column) - position.column;
+		const suffixDelta = this._lineSuffix.value ? this._lineSuffix.value.delta(this._editor.getPosition()) : 0;
 
 		SnippetController2.get(this._editor).insert(insertText, {
 			overwriteBefore: overwriteBefore + columnDelta,
@@ -367,7 +355,7 @@ export class SuggestController implements IEditorContribution {
 				return true;
 			}
 			const position = this._editor.getPosition()!;
-			const startColumn = item.completion.range.startColumn;
+			const startColumn = item.editStart.column;
 			const endColumn = position.column;
 			if (endColumn - startColumn !== item.completion.insertText.length) {
 				// unequal lengths -> makes edit
diff --git a/src/vs/monaco.d.ts b/src/vs/monaco.d.ts
index 18e0a9abe18..2fa34ea2ea6 100644
--- a/src/vs/monaco.d.ts
+++ b/src/vs/monaco.d.ts
@@ -4765,7 +4765,10 @@ declare namespace monaco.languages {
 		 * *Note:* The range must be a [single line](#Range.isSingleLine) and it must
 		 * [contain](#Range.contains) the position at which completion has been [requested](#CompletionItemProvider.provideCompletionItems).
 		 */
-		range: IRange;
+		range: IRange | {
+			insert: IRange;
+			replace: IRange;
+		};
 		/**
 		 * An optional set of characters that when pressed while this completion is active will accept it first and
 		 * then type that character. *Note* that all commit characters should have `length=1` and that superfluous
diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 2e430b02494..e80e129efc0 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -3393,15 +3393,17 @@ declare module 'vscode' {
 		insertText?: string | SnippetString;
 
 		/**
-		 * A range of text that should be replaced by this completion item.
+		 * A range or a insert and replace range selecting the text that should be replaced by this completion item.
 		 *
-		 * Defaults to a range from the start of the [current word](#TextDocument.getWordRangeAtPosition) to the
-		 * current position.
+		 * When omitted, the range of the [current word](#TextDocument.getWordRangeAtPosition) is used as replace-range
+		 * and as insert-range the start of the [current word](#TextDocument.getWordRangeAtPosition) to the
+		 * current position is used.
 		 *
-		 * *Note:* The range must be a [single line](#Range.isSingleLine) and it must
+		 * *Note 1:* A range must be a [single line](#Range.isSingleLine) and it must
 		 * [contain](#Range.contains) the position at which completion has been [requested](#CompletionItemProvider.provideCompletionItems).
+		 * *Note 2:* A insert range must be a prefix of a replace range, that means it must be contained and starting at the same position.
 		 */
-		range?: Range;
+		range?: Range | { insert: Range; replace: Range; };
 
 		/**
 		 * An optional set of characters that when pressed while this completion is active will accept it first and
diff --git a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
index 05bc4303f3e..8b57f6097fc 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
@@ -326,7 +326,8 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 
 	// --- suggest
 
-	private static _inflateSuggestDto(defaultRange: IRange, data: ISuggestDataDto): modes.CompletionItem {
+	private static _inflateSuggestDto(defaultRange: IRange | { insert: IRange, replace: IRange }, data: ISuggestDataDto): modes.CompletionItem {
+
 		return {
 			label: data[ISuggestDataDtoField.label],
 			kind: data[ISuggestDataDtoField.kind],
@@ -337,8 +338,8 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 			filterText: data[ISuggestDataDtoField.filterText],
 			preselect: data[ISuggestDataDtoField.preselect],
 			insertText: typeof data.h === 'undefined' ? data[ISuggestDataDtoField.label] : data.h,
-			insertTextRules: data[ISuggestDataDtoField.insertTextRules],
 			range: data[ISuggestDataDtoField.range] || defaultRange,
+			insertTextRules: data[ISuggestDataDtoField.insertTextRules],
 			commitCharacters: data[ISuggestDataDtoField.commitCharacters],
 			additionalTextEdits: data[ISuggestDataDtoField.additionalTextEdits],
 			command: data[ISuggestDataDtoField.command],
@@ -370,6 +371,7 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 					if (!result) {
 						return suggestion;
 					}
+
 					let newSuggestion = MainThreadLanguageFeatures._inflateSuggestDto(suggestion.range, result);
 					return mixin(suggestion, newSuggestion, true);
 				});
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 59675a4794b..26671937bea 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -970,7 +970,7 @@ export interface ISuggestDataDto {
 	[ISuggestDataDtoField.preselect]?: boolean;
 	[ISuggestDataDtoField.insertText]?: string;
 	[ISuggestDataDtoField.insertTextRules]?: modes.CompletionItemInsertTextRule;
-	[ISuggestDataDtoField.range]?: IRange;
+	[ISuggestDataDtoField.range]?: IRange | { insert: IRange, replace: IRange };
 	[ISuggestDataDtoField.commitCharacters]?: string[];
 	[ISuggestDataDtoField.additionalTextEdits]?: ISingleEditOperation[];
 	[ISuggestDataDtoField.command]?: modes.Command;
@@ -981,7 +981,7 @@ export interface ISuggestDataDto {
 
 export interface ISuggestResultDto {
 	x?: number;
-	a: IRange;
+	a: { insert: IRange, replace: IRange };
 	b: ISuggestDataDto[];
 	c?: boolean;
 }
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index 872fd2be5e8..b32418267fb 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -658,13 +658,13 @@ class SuggestAdapter {
 			this._disposables.set(pid, disposables);
 
 			// the default text edit range
-			const wordRangeBeforePos = (doc.getWordRangeAtPosition(pos) as Range || new Range(pos, pos))
-				.with({ end: pos });
+			const replaceRange = doc.getWordRangeAtPosition(pos) || new Range(pos, pos);
+			const insertRange = replaceRange.with({ end: pos });
 
 			const result: extHostProtocol.ISuggestResultDto = {
 				x: pid,
 				b: [],
-				a: typeConvert.Range.from(wordRangeBeforePos),
+				a: { replace: typeConvert.Range.from(replaceRange), insert: typeConvert.Range.from(insertRange) },
 				c: list.isIncomplete || undefined
 			};
 
@@ -751,21 +751,44 @@ class SuggestAdapter {
 		}
 
 		// 'overwrite[Before|After]'-logic
-		let range: vscode.Range | undefined;
+		let range: vscode.Range | { insert: vscode.Range, replace: vscode.Range } | undefined;
 		if (item.textEdit) {
 			range = item.textEdit.range;
 		} else if (item.range) {
 			range = item.range;
 		}
-		result[extHostProtocol.ISuggestDataDtoField.range] = typeConvert.Range.from(range);
 
-		if (range && (!range.isSingleLine || range.start.line !== position.line)) {
-			console.warn('INVALID text edit -> must be single line and on the same line');
-			return undefined;
+		if (range) {
+			if (Range.isRange(range)) {
+				if (!SuggestAdapter._isValidRangeForCompletion(range, position)) {
+					console.trace('INVALID range -> must be single line and on the same line');
+					return undefined;
+				}
+				result[extHostProtocol.ISuggestDataDtoField.range] = typeConvert.Range.from(range);
+
+			} else {
+				if (
+					!SuggestAdapter._isValidRangeForCompletion(range.insert, position)
+					|| !SuggestAdapter._isValidRangeForCompletion(range.replace, position)
+					|| !range.insert.start.isEqual(range.replace.start)
+					|| !range.replace.contains(range.insert)
+				) {
+					console.trace('INVALID range -> must be single line, on the same line, insert range must be a prefix of replace range');
+					return undefined;
+				}
+				result[extHostProtocol.ISuggestDataDtoField.range] = {
+					insert: typeConvert.Range.from(range.insert),
+					replace: typeConvert.Range.from(range.replace)
+				};
+			}
 		}
 
 		return result;
 	}
+
+	private static _isValidRangeForCompletion(range: vscode.Range, position: vscode.Position): boolean {
+		return range.isSingleLine || range.start.line === position.line;
+	}
 }
 
 class SignatureHelpAdapter {
diff --git a/src/vs/workbench/api/common/extHostTypeConverters.ts b/src/vs/workbench/api/common/extHostTypeConverters.ts
index c3f84a27286..b9eeee2ac6b 100644
--- a/src/vs/workbench/api/common/extHostTypeConverters.ts
+++ b/src/vs/workbench/api/common/extHostTypeConverters.ts
@@ -15,7 +15,7 @@ import { URI, UriComponents } from 'vs/base/common/uri';
 import { ProgressLocation as MainProgressLocation } from 'vs/platform/progress/common/progress';
 import { SaveReason } from 'vs/workbench/services/textfile/common/textfiles';
 import { IPosition } from 'vs/editor/common/core/position';
-import { IRange } from 'vs/editor/common/core/range';
+import * as editorRange from 'vs/editor/common/core/range';
 import { ISelection } from 'vs/editor/common/core/selection';
 import * as htmlContent from 'vs/base/common/htmlContent';
 import * as languageSelector from 'vs/editor/common/modes/languageSelector';
@@ -68,9 +68,9 @@ export namespace Selection {
 export namespace Range {
 
 	export function from(range: undefined): undefined;
-	export function from(range: RangeLike): IRange;
-	export function from(range: RangeLike | undefined): IRange | undefined;
-	export function from(range: RangeLike | undefined): IRange | undefined {
+	export function from(range: RangeLike): editorRange.IRange;
+	export function from(range: RangeLike | undefined): editorRange.IRange | undefined;
+	export function from(range: RangeLike | undefined): editorRange.IRange | undefined {
 		if (!range) {
 			return undefined;
 		}
@@ -84,9 +84,9 @@ export namespace Range {
 	}
 
 	export function to(range: undefined): types.Range;
-	export function to(range: IRange): types.Range;
-	export function to(range: IRange | undefined): types.Range | undefined;
-	export function to(range: IRange | undefined): types.Range | undefined {
+	export function to(range: editorRange.IRange): types.Range;
+	export function to(range: editorRange.IRange | undefined): types.Range | undefined;
+	export function to(range: editorRange.IRange | undefined): types.Range | undefined {
 		if (!range) {
 			return undefined;
 		}
@@ -821,14 +821,14 @@ export namespace CompletionItem {
 		result.filterText = suggestion.filterText;
 		result.preselect = suggestion.preselect;
 		result.commitCharacters = suggestion.commitCharacters;
-		result.range = Range.to(suggestion.range);
+		result.range = editorRange.Range.isIRange(suggestion.range) ? Range.to(suggestion.range) : { insert: Range.to(suggestion.range.insert), replace: Range.to(suggestion.range.replace) };
 		result.keepWhitespace = typeof suggestion.insertTextRules === 'undefined' ? false : Boolean(suggestion.insertTextRules & modes.CompletionItemInsertTextRule.KeepWhitespace);
 		// 'inserText'-logic
 		if (typeof suggestion.insertTextRules !== 'undefined' && suggestion.insertTextRules & modes.CompletionItemInsertTextRule.InsertAsSnippet) {
 			result.insertText = new types.SnippetString(suggestion.insertText);
 		} else {
 			result.insertText = suggestion.insertText;
-			result.textEdit = new types.TextEdit(result.range, result.insertText);
+			result.textEdit = result.range instanceof types.Range ? new types.TextEdit(result.range, result.insertText) : undefined;
 		}
 		// TODO additionalEdits, command
 
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index a5644289cf7..c765f8d930e 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1343,7 +1343,7 @@ export class CompletionItem implements vscode.CompletionItem {
 	preselect?: boolean;
 	insertText?: string | SnippetString;
 	keepWhitespace?: boolean;
-	range?: Range;
+	range?: Range | { insert: Range; replace: Range; };
 	commitCharacters?: string[];
 	textEdit?: TextEdit;
 	additionalTextEdits?: TextEdit[];
diff --git a/src/vs/workbench/contrib/snippets/test/browser/snippetsService.test.ts b/src/vs/workbench/contrib/snippets/test/browser/snippetsService.test.ts
index 298f9a71b6c..f120a12e2d9 100644
--- a/src/vs/workbench/contrib/snippets/test/browser/snippetsService.test.ts
+++ b/src/vs/workbench/contrib/snippets/test/browser/snippetsService.test.ts
@@ -84,7 +84,7 @@ suite('SnippetsService', function () {
 			assert.equal(result.incomplete, undefined);
 			assert.equal(result.suggestions.length, 1);
 			assert.equal(result.suggestions[0].label, 'bar');
-			assert.equal(result.suggestions[0].range.startColumn, 1);
+			assert.equal((result.suggestions[0].range as any).startColumn, 1);
 			assert.equal(result.suggestions[0].insertText, 'barCodeSnippet');
 		});
 	});
@@ -117,10 +117,10 @@ suite('SnippetsService', function () {
 			assert.equal(result.suggestions.length, 2);
 			assert.equal(result.suggestions[0].label, 'bar');
 			assert.equal(result.suggestions[0].insertText, 's1');
-			assert.equal(result.suggestions[0].range.startColumn, 1);
+			assert.equal((result.suggestions[0].range as any).startColumn, 1);
 			assert.equal(result.suggestions[1].label, 'bar-bar');
 			assert.equal(result.suggestions[1].insertText, 's2');
-			assert.equal(result.suggestions[1].range.startColumn, 1);
+			assert.equal((result.suggestions[1].range as any).startColumn, 1);
 		});
 
 		await provider.provideCompletionItems(model, new Position(1, 5), context)!.then(result => {
@@ -128,7 +128,7 @@ suite('SnippetsService', function () {
 			assert.equal(result.suggestions.length, 1);
 			assert.equal(result.suggestions[0].label, 'bar-bar');
 			assert.equal(result.suggestions[0].insertText, 's2');
-			assert.equal(result.suggestions[0].range.startColumn, 1);
+			assert.equal((result.suggestions[0].range as any).startColumn, 1);
 		});
 
 		await provider.provideCompletionItems(model, new Position(1, 6), context)!.then(result => {
@@ -136,10 +136,10 @@ suite('SnippetsService', function () {
 			assert.equal(result.suggestions.length, 2);
 			assert.equal(result.suggestions[0].label, 'bar');
 			assert.equal(result.suggestions[0].insertText, 's1');
-			assert.equal(result.suggestions[0].range.startColumn, 5);
+			assert.equal((result.suggestions[0].range as any).startColumn, 5);
 			assert.equal(result.suggestions[1].label, 'bar-bar');
 			assert.equal(result.suggestions[1].insertText, 's2');
-			assert.equal(result.suggestions[1].range.startColumn, 1);
+			assert.equal((result.suggestions[1].range as any).startColumn, 1);
 		});
 	});
 
@@ -165,14 +165,14 @@ suite('SnippetsService', function () {
 			return provider.provideCompletionItems(model, new Position(1, 4), context)!;
 		}).then(result => {
 			assert.equal(result.suggestions.length, 1);
-			assert.equal(result.suggestions[0].range.startColumn, 2);
+			assert.equal((result.suggestions[0].range as any).startColumn, 2);
 			model.dispose();
 
 			model = TextModel.createFromString('a<?', undefined, modeService.getLanguageIdentifier('fooLang'));
 			return provider.provideCompletionItems(model, new Position(1, 4), context)!;
 		}).then(result => {
 			assert.equal(result.suggestions.length, 1);
-			assert.equal(result.suggestions[0].range.startColumn, 2);
+			assert.equal((result.suggestions[0].range as any).startColumn, 2);
 			model.dispose();
 		});
 	});
@@ -400,13 +400,13 @@ suite('SnippetsService', function () {
 
 		assert.equal(result.suggestions.length, 1);
 		let [first] = result.suggestions;
-		assert.equal(first.range.startColumn, 2);
+		assert.equal((first.range as any).startColumn, 2);
 
 		model = TextModel.createFromString('1', undefined, modeService.getLanguageIdentifier('fooLang'));
 		result = await provider.provideCompletionItems(model, new Position(1, 2), context)!;
 
 		assert.equal(result.suggestions.length, 1);
 		[first] = result.suggestions;
-		assert.equal(first.range.startColumn, 1);
+		assert.equal((first.range as any).startColumn, 1);
 	});
 });
diff --git a/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts b/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
index 9664bc68bd0..d8e1e01cbb3 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostApiCommands.test.ts
@@ -412,11 +412,8 @@ suite('ExtHostLanguageFeatureCommands', function () {
 				assert.equal(values.length, 4);
 				let [first, second, third, fourth] = values;
 				assert.equal(first.label, 'item1');
-				assert.equal(first.textEdit!.newText, 'item1');
-				assert.equal(first.textEdit!.range.start.line, 0);
-				assert.equal(first.textEdit!.range.start.character, 0);
-				assert.equal(first.textEdit!.range.end.line, 0);
-				assert.equal(first.textEdit!.range.end.character, 4);
+				assert.equal(first.textEdit, undefined);// no text edit, default ranges
+				assert.ok(!types.Range.isRange(first.range));
 
 				assert.equal(second.label, 'item2');
 				assert.equal(second.textEdit!.newText, 'foo');
@@ -434,10 +431,13 @@ suite('ExtHostLanguageFeatureCommands', function () {
 
 				assert.equal(fourth.label, 'item4');
 				assert.equal(fourth.textEdit, undefined);
-				assert.equal(fourth.range!.start.line, 0);
-				assert.equal(fourth.range!.start.character, 1);
-				assert.equal(fourth.range!.end.line, 0);
-				assert.equal(fourth.range!.end.character, 4);
+
+				const range: any = fourth.range!;
+				assert.ok(types.Range.isRange(range));
+				assert.equal(range.start.line, 0);
+				assert.equal(range.start.character, 1);
+				assert.equal(range.end.line, 0);
+				assert.equal(range.end.character, 4);
 				assert.ok(fourth.insertText instanceof types.SnippetString);
 				assert.equal((<types.SnippetString>fourth.insertText).value, 'foo$0bar');
 			});