diff --git a/src/common/basic/compiler.ts b/src/common/basic/compiler.ts
index b6936c05..cf107bae 100644
--- a/src/common/basic/compiler.ts
+++ b/src/common/basic/compiler.ts
@@ -262,6 +262,7 @@ export class BASICParser {
     decls: { [name: string]: SourceLocation }; // declared/set vars
     refs: { [name: string]: SourceLocation }; // references
 
+    path : string;
     lineno : number;
     tokens: Token[];
     eol: Token;
@@ -281,7 +282,7 @@ export class BASICParser {
     compileError(msg: string, loc?: SourceLocation) {
         if (!loc) loc = this.peekToken().$loc;
         // TODO: pass SourceLocation to errors
-        this.errors.push({line:loc.line, msg:msg});
+        this.errors.push({path:loc.path, line:loc.line, msg:msg});
         throw new CompileError(`${msg} (line ${loc.line})`); // TODO: label too?
     }
     dialectError(what: string, loc?: SourceLocation) {
@@ -336,6 +337,7 @@ export class BASICParser {
         }
     }
     parseFile(file: string, path: string) : BASICProgram {
+        this.path = path;
         var pgmlines = file.split("\n").map((line) => this.parseLine(line));
         var program = { opts: this.opts, lines: pgmlines };
         this.checkAll(program);
@@ -369,13 +371,13 @@ export class BASICParser {
                     this.tokens.push({
                         str: s,
                         type: i,
-                        $loc: { line: this.lineno, start: m.index, end: m.index+s.length }
+                        $loc: { path: this.path, line: this.lineno, start: m.index, end: m.index+s.length }
                     });
                     break;
                 }
             }
         }
-        this.eol = { type: TokenType.EOL, str: "", $loc: { line: this.lineno, start: line.length } };
+        this.eol = { type: TokenType.EOL, str: "", $loc: { path: this.path, line: this.lineno, start: line.length } };
     }
     parse() : BASICLine {
         var line = {label: null, stmts: []};
@@ -444,7 +446,7 @@ export class BASICParser {
                 this.compileError(`There should be a command here.`);
                 return null;
         }
-        if (stmt) stmt.$loc = { line: cmdtok.$loc.line, start: cmdtok.$loc.start, end: this.peekToken().$loc.start };
+        if (stmt) stmt.$loc = { path: cmdtok.$loc.path, line: cmdtok.$loc.line, start: cmdtok.$loc.start, end: this.peekToken().$loc.start };
         return stmt;
     }
     parseVarSubscriptOrFunc(): IndOp {
diff --git a/src/common/basic/runtime.ts b/src/common/basic/runtime.ts
index 4acdc551..adc5c62f 100644
--- a/src/common/basic/runtime.ts
+++ b/src/common/basic/runtime.ts
@@ -1,6 +1,7 @@
 
 import * as basic from "./compiler";
 import { EmuHalt } from "../emu";
+import { SourceLocation } from "../workertypes";
 
 function isLiteral(arg: basic.Expr): arg is basic.Literal {
     return (arg as any).value != null;
@@ -110,9 +111,9 @@ export class BASICRuntime {
 
     runtimeError(msg : string) {
         this.curpc--; // we did curpc++ before executing statement
-        // TODO: pass source location to error
-        throw new EmuHalt(`${msg} (line ${this.getLabelForPC(this.curpc)})`);
+        throw new EmuHalt(msg, this.getCurrentSourceLocation());
     }
+    
     dialectError(what : string) {
         this.runtimeError(`I can't ${what} in this dialect of BASIC.`);
     }
@@ -132,6 +133,11 @@ export class BASICRuntime {
         return pgmline ? pgmline.label : '?';
     }
 
+    getCurrentSourceLocation() : SourceLocation {
+        var stmt = this.getStatement();
+        return stmt && stmt.$loc;
+    }
+
     getStatement() {
         return this.allstmts[this.curpc];
     }
diff --git a/src/common/emu.ts b/src/common/emu.ts
index d0ff10dc..5288e951 100644
--- a/src/common/emu.ts
+++ b/src/common/emu.ts
@@ -1,6 +1,7 @@
 "use strict";
 
 import { hex, clamp, lpad } from "./util";
+import { SourceLocation } from "./workertypes";
 
 // external modules
 declare var jt, Javatari;
@@ -225,8 +226,10 @@ export class RAM {
 }
 
 export class EmuHalt extends Error {
-  constructor(msg:string) {
+  $loc : SourceLocation;
+  constructor(msg: string, loc?: SourceLocation) {
     super(msg);
+    this.$loc = loc;
     Object.setPrototypeOf(this, EmuHalt.prototype);
   }
 }
diff --git a/src/common/workertypes.ts b/src/common/workertypes.ts
index 88d201e2..e635b4e3 100644
--- a/src/common/workertypes.ts
+++ b/src/common/workertypes.ts
@@ -3,13 +3,14 @@ export type FileData = string | Uint8Array;
 
 export interface SourceLocation {
   line: number;
+  label?: string;
+  path?: string; // TODO: make mandatory?
   start?: number;
   end?: number;
 }
 
-export interface SourceLine {
+export interface SourceLine extends SourceLocation {
   offset:number;
-  line:number;
   insns?:string;
   iscode?:boolean;
   cycles?:number;
diff --git a/src/ide/ui.ts b/src/ide/ui.ts
index 6b5e66db..a2eb32d6 100644
--- a/src/ide/ui.ts
+++ b/src/ide/ui.ts
@@ -1884,7 +1884,12 @@ function globalErrorHandler(msgevent) {
   if (msg.indexOf("QuotaExceededError") >= 0) {
     requestPersistPermission(false, false);
   } else {
-    showErrorAlert([{msg:msg,line:0}]);
+    var err = msgevent.error;
+    var werr : WorkerError = {msg:msg, line:0};
+    if (err instanceof EmuHalt && err.$loc) {
+      werr = {msg:msg, path:err.$loc.path, line:err.$loc.line}; // TODO: get start/end columns
+    }
+    showErrorAlert([werr]);
   }
 }