diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index cd7ada607f9..0ddea8baf08 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6683,7 +6683,6 @@ module ts {
                 return;
             }
 
-            var symbol = getSymbolOfNode(signatureDeclarationNode);
             // TypeScript 1.0 spec (April 2014): 3.7.2.4
             // Every specialized call or construct signature in an object type must be assignable
             // to at least one non-specialized call or construct signature in the same object type
@@ -8811,7 +8810,6 @@ module ts {
                 // parent is not source file or it is not reference to internal module
                 return false;
             }
-            var symbol = getSymbolOfNode(node);
             return isImportResolvedToValue(getSymbolOfNode(node));
         }
 
diff --git a/src/harness/compilerRunner.ts b/src/harness/compilerRunner.ts
index f23647024f9..7045a1196d0 100644
--- a/src/harness/compilerRunner.ts
+++ b/src/harness/compilerRunner.ts
@@ -285,12 +285,10 @@ class CompilerBaselineRunner extends RunnerBase {
                             typeLines.push('=== ' + file.unitName + ' ===\r\n');
                             for (var i = 0; i < codeLines.length; i++) {
                                 var currentCodeLine = codeLines[i];
-                                var lastLine = typeLines[typeLines.length];
                                 typeLines.push(currentCodeLine + '\r\n');
                                 if (typeMap[file.unitName]) {
                                     var typeInfo = typeMap[file.unitName][i];
                                     if (typeInfo) {
-                                        var leadingSpaces = '';
                                         typeInfo.forEach(ty => {
                                             typeLines.push('>' + ty + '\r\n');
                                         });
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index 5d8e48da8ca..eb338f87027 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -2074,10 +2074,6 @@ module FourSlash {
             }
         }
 
-        private getEOF(): number {
-            return this.languageServiceShimHost.getScriptSnapshot(this.activeFile.fileName).getLength();
-        }
-
         // Get the text of the entire line the caret is currently at
         private getCurrentLineContent() {
             // The current caret position (in line/col terms)
@@ -2193,14 +2189,6 @@ module FourSlash {
             return result;
         }
 
-        private getCurrentLineNumberZeroBased() {
-            return this.getCurrentLineNumberOneBased() - 1;
-        }
-
-        private getCurrentLineNumberOneBased() {
-            return this.languageServiceShimHost.positionToZeroBasedLineCol(this.activeFile.fileName, this.currentCaretPosition).line + 1;
-        }
-
         private getLineColStringAtPosition(position: number) {
             var pos = this.languageServiceShimHost.positionToZeroBasedLineCol(this.activeFile.fileName, position);
             return 'line ' + (pos.line + 1) + ', col ' + pos.character;
diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index 14e2c9b42d4..8203fa3c23f 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -1092,7 +1092,6 @@ module Harness {
             /** @param fileResults an array of strings for the fileName and an ITextWriter with its code */
             constructor(fileResults: GeneratedFile[], errors: HarnessDiagnostic[], public program: ts.Program,
                 public currentDirectoryForProgram: string, private sourceMapData: ts.SourceMapData[]) {
-                var lines: string[] = [];
 
                 fileResults.forEach(emittedFile => {
                     if (isDTS(emittedFile.fileName)) {
@@ -1246,7 +1245,6 @@ module Harness {
 
     /** Support class for baseline files */
     export module Baseline {
-        var firstRun = true;
 
         export interface BaselineOptions {
             LineEndingSensitive?: boolean;
@@ -1287,8 +1285,7 @@ module Harness {
                 IO.createDirectory(dirName);
                 fileCache[dirName] = true;
             }
-            var parentDir = IO.directoryName(actualFilename); // .../tests/baselines/local
-            var parentParentDir = IO.directoryName(IO.directoryName(actualFilename)) // .../tests/baselines
+
             // Create folders if needed
             createDirectoryStructure(Harness.IO.directoryName(actualFilename));
 
diff --git a/src/services/services.ts b/src/services/services.ts
index 8f021e76f8d..4a92ec1985f 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -144,7 +144,7 @@ module ts {
             while (pos < end) {
                 var token = scanner.scan();
                 var textPos = scanner.getTextPos();
-                var node = nodes.push(createNode(token, pos, textPos, NodeFlags.Synthetic, this));
+                nodes.push(createNode(token, pos, textPos, NodeFlags.Synthetic, this));
                 pos = textPos;
             }
             return pos;
@@ -662,8 +662,6 @@ module ts {
         }
     }
 
-    var incrementalParse: IncrementalParse = TypeScript.IncrementalParser.parse;
-
     class SourceFileObject extends NodeObject implements SourceFile {
         public filename: string;
         public text: string;
@@ -763,10 +761,6 @@ module ts {
             return this.namedDeclarations;
         }
 
-        private isDeclareFile(): boolean {
-            return TypeScript.isDTSFile(this.filename);
-        }
-
         public update(scriptSnapshot: TypeScript.IScriptSnapshot, version: string, isOpen: boolean, textChangeRange: TypeScript.TextChangeRange): SourceFile {
             if (textChangeRange && Debug.shouldAssert(AssertionLevel.Normal)) {
                 var oldText = this.scriptSnapshot;
@@ -3735,9 +3729,6 @@ module ts {
 
                 pushKeywordIf(keywords, switchStatement.getFirstToken(), SyntaxKind.SwitchKeyword);
 
-                // Types of break statements we can grab on to.
-                var breakSearchType = BreakContinueSearchType.All;
-
                 // Go through each clause in the switch statement, collecting the 'case'/'default' keywords.
                 forEach(switchStatement.clauses, clause => {
                     pushKeywordIf(keywords, clause.getFirstToken(), SyntaxKind.CaseKeyword, SyntaxKind.DefaultKeyword);
@@ -4611,7 +4602,6 @@ module ts {
             var targetSourceFile = program.getSourceFile(filename);  // Current selected file to be output
             // If --out flag is not specified, shouldEmitToOwnFile is true. Otherwise shouldEmitToOwnFile is false.
             var shouldEmitToOwnFile = ts.shouldEmitToOwnFile(targetSourceFile, compilerOptions);
-            var emitDeclaration = compilerOptions.declaration;
             var emitOutput: EmitOutput = {
                 outputFiles: [],
                 emitOutputStatus: undefined,
@@ -4628,7 +4618,6 @@ module ts {
             // Initialize writer for CompilerHost.writeFile
             writer = getEmitOutputWriter;
 
-            var syntacticDiagnostics: Diagnostic[] = [];
             var containSyntacticErrors = false;
 
             if (shouldEmitToOwnFile) {
@@ -5567,7 +5556,6 @@ module ts {
 
         function getClassificationsForLine(text: string, lexState: EndOfLineState): ClassificationResult {
             var offset = 0;
-            var lastTokenOrCommentEnd = 0;
             var token = SyntaxKind.Unknown;
             var lastNonTriviaToken = SyntaxKind.Unknown;