Improve column number tracking

- simplify column number tracking using a pointer to the beginning of line
  instead of `eol` + `mark`.
- add `js_parse_error_pos` to report syntax errors with exact source position
  for token parsing errors. This makes the syntax error reports much more precise.
  eg: exact position of UTF-8 encoding error, invalid escape sequence, etc.
- add `JSSourcePos` type to use single opaque object for token source position
- add `emit_pos` to set the precise source position in code generation
- change `emit_op` to no longer emit source positions from `s->last_line_num` and `s->last_col_num`.
- remove `last_line_num` and `last_col_num` `JSParserState` members
- runtime errors on calls report the column number of calling function or method name.
- runtime errors on `new` expressions report the column number of the `neẁ` keyword.
- do not show source position in backtrace if debug information is missing
- fix spurious parsing bugs when `js_parse_skip_parens_token` could not reparse
  the current token because of stack overflow detection.
- `js_parse_save_pos` now saves the current token and `js_parse_seek_back` always
  restores the token, hence never fails, while `js_parse_seek_token` reparses the
  saved token. This is needed to handle the weird semantics of `"\1"; "use strict";`
- simplify html comment detection
- update **tests/test_builtin,js** with more informative messages
- improve `assert()` and **tests/test_language.js** tests
- update **v8.txt** for updated column numbers in remaining errors

gen/function_source.c

@@ -2,9 +2,9 @@
 
 #include "quickjs-libc.h"
 
-const uint32_t qjsc_function_source_size = 384;
+const uint32_t qjsc_function_source_size = 404;
 
-const uint8_t qjsc_function_source[384] = {
+const uint8_t qjsc_function_source[404] = {
  0x0c, 0x06, 0x0c, 0x61, 0x63, 0x74, 0x75, 0x61,
  0x6c, 0x02, 0x66, 0x30, 0x74, 0x65, 0x73, 0x74,
  0x73, 0x2f, 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69,
@@ -23,7 +23,7 @@ const uint8_t qjsc_function_source[384] = {
  0xe0, 0x01, 0x00, 0x01, 0x00, 0x0c, 0x43, 0xfa,
  0x01, 0xb4, 0x03, 0x00, 0x00, 0x00, 0x01, 0x00,
  0x00, 0x03, 0x00, 0xbb, 0x2a, 0x28, 0xb6, 0x03,
- 0x03, 0x01, 0x04, 0x02, 0x1e, 0x0c, 0x0e, 0x1a,
+ 0x03, 0x01, 0x04, 0x02, 0x2c, 0x0c, 0x0d, 0x1a,
  0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e,
  0x20, 0x66, 0x28, 0x29, 0x20, 0x7b, 0x20, 0x72,
  0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x34, 0x32,
@@ -47,12 +47,15 @@ const uint8_t qjsc_function_source[384] = {
  0x38, 0xdc, 0x00, 0x00, 0x00, 0xaf, 0xe9, 0x0b,
  0x38, 0x92, 0x00, 0x00, 0x00, 0x62, 0x03, 0x00,
  0xee, 0x2f, 0x68, 0x03, 0x00, 0x68, 0x02, 0x00,
- 0xc4, 0x28, 0xb6, 0x03, 0x01, 0x01, 0x28, 0x60,
+ 0xc4, 0x28, 0xb6, 0x03, 0x01, 0x01, 0x3c, 0xc6,
- 0x01, 0x49, 0x02, 0x21, 0x1a, 0x1b, 0x04, 0x1e,
+ 0x1e, 0x1b, 0x03, 0x00, 0x08, 0x08, 0x0c, 0x1b,
- 0x1d, 0x12, 0x26, 0x49, 0x1d, 0x0c, 0x06, 0x11,
+ 0x04, 0x2a, 0x07, 0x12, 0x11, 0x11, 0x16, 0x1b,
- 0x18, 0x2a, 0x1c, 0x37, 0x41, 0x21, 0x1c, 0x34,
+ 0x07, 0x11, 0x24, 0x1b, 0x0c, 0x11, 0x0b, 0x07,
- 0x18, 0x1b, 0x04, 0x26, 0x11, 0x3f, 0x1d, 0x0c,
+ 0x0b, 0x00, 0x07, 0x08, 0x19, 0x1b, 0x0a, 0x1b,
- 0x06, 0x11, 0x18, 0x2a, 0x1c, 0x53, 0x41, 0x00,
+ 0x12, 0x1b, 0x03, 0x07, 0x17, 0x1b, 0x03, 0x08,
+ 0x0e, 0x11, 0x04, 0x2a, 0x07, 0x12, 0x11, 0x11,
+ 0x16, 0x1b, 0x07, 0x11, 0x24, 0x1b, 0x0c, 0x11,
+ 0x0b, 0x07, 0x0b, 0x00,
 };
 
 static JSContext *JS_NewCustomContext(JSRuntime *rt)

gen/hello.c

@@ -2,9 +2,9 @@
 
 #include "quickjs-libc.h"
 
-const uint32_t qjsc_hello_size = 89;
+const uint32_t qjsc_hello_size = 95;
 
-const uint8_t qjsc_hello[89] = {
+const uint8_t qjsc_hello[95] = {
  0x0c, 0x04, 0x0e, 0x63, 0x6f, 0x6e, 0x73, 0x6f,
  0x6c, 0x65, 0x06, 0x6c, 0x6f, 0x67, 0x16, 0x48,
  0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x57, 0x6f, 0x72,
@@ -15,8 +15,8 @@ const uint8_t qjsc_hello[89] = {
  0x14, 0x01, 0xa0, 0x01, 0x00, 0x00, 0x00, 0x38,
  0xd9, 0x00, 0x00, 0x00, 0x42, 0xda, 0x00, 0x00,
  0x00, 0x04, 0xdb, 0x00, 0x00, 0x00, 0x24, 0x01,
- 0x00, 0xcc, 0x28, 0xb8, 0x03, 0x01, 0x01, 0x00,
+ 0x00, 0xcc, 0x28, 0xb8, 0x03, 0x01, 0x01, 0x06,
- 0x00,
+ 0x1b, 0x10, 0x1b, 0x08, 0x1b, 0x07, 0x00,
 };
 
 static JSContext *JS_NewCustomContext(JSRuntime *rt)

gen/hello_module.c

@@ -2,9 +2,9 @@
 
 #include "quickjs-libc.h"
 
-const uint32_t qjsc_fib_module_size = 310;
+const uint32_t qjsc_fib_module_size = 316;
 
-const uint8_t qjsc_fib_module[310] = {
+const uint8_t qjsc_fib_module[316] = {
  0x0c, 0x03, 0x2c, 0x65, 0x78, 0x61, 0x6d, 0x70,
  0x6c, 0x65, 0x73, 0x2f, 0x66, 0x69, 0x62, 0x5f,
  0x6d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x2e, 0x6a,
@@ -19,36 +19,37 @@ const uint8_t qjsc_fib_module[310] = {
  0xb3, 0x28, 0xd0, 0xb4, 0xac, 0xe9, 0x03, 0xb4,
  0x28, 0xdc, 0xd0, 0xb4, 0x9e, 0xee, 0xdc, 0xd0,
  0xb5, 0x9e, 0xee, 0x9d, 0x28, 0xb2, 0x03, 0x02,
- 0x08, 0x20, 0x04, 0x00, 0x07, 0x06, 0x07, 0x06,
+ 0x08, 0x2c, 0x04, 0x02, 0x07, 0x0a, 0x07, 0x05,
- 0x12, 0x09, 0x08, 0x07, 0x07, 0x10, 0x07, 0x06,
+ 0x12, 0x0a, 0x07, 0x0d, 0x08, 0x0a, 0x07, 0x0a,
- 0x07, 0x06, 0x12, 0x13, 0x08, 0x07, 0x08, 0x16,
+ 0x07, 0x05, 0x12, 0x00, 0x07, 0x0d, 0x09, 0x0e,
- 0x0c, 0x0c, 0x07, 0x04, 0x0c, 0x0a, 0x0c, 0x0c,
+ 0x07, 0x08, 0x07, 0x08, 0x07, 0x03, 0x07, 0x0b,
- 0x07, 0x04, 0x8d, 0x01, 0x66, 0x75, 0x6e, 0x63,
+ 0x07, 0x1a, 0x07, 0x08, 0x07, 0x08, 0x07, 0x03,
- 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x66, 0x69, 0x62,
+ 0x07, 0x0b, 0x07, 0x03, 0x07, 0x23, 0x8d, 0x01,
- 0x28, 0x6e, 0x29, 0x0a, 0x7b, 0x0a, 0x20, 0x20,
+ 0x66, 0x75, 0x6e, 0x63, 0x74, 0x69, 0x6f, 0x6e,
- 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x6e, 0x20,
+ 0x20, 0x66, 0x69, 0x62, 0x28, 0x6e, 0x29, 0x0a,
- 0x3c, 0x3d, 0x20, 0x30, 0x29, 0x0a, 0x20, 0x20,
+ 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x66,
- 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x72, 0x65,
+ 0x20, 0x28, 0x6e, 0x20, 0x3c, 0x3d, 0x20, 0x30,
- 0x74, 0x75, 0x72, 0x6e, 0x20, 0x30, 0x3b, 0x0a,
+ 0x29, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
- 0x20, 0x20, 0x20, 0x20, 0x65, 0x6c, 0x73, 0x65,
+ 0x20, 0x20, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e,
- 0x20, 0x69, 0x66, 0x20, 0x28, 0x6e, 0x20, 0x3d,
+ 0x20, 0x30, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20,
- 0x3d, 0x20, 0x31, 0x29, 0x0a, 0x20, 0x20, 0x20,
+ 0x65, 0x6c, 0x73, 0x65, 0x20, 0x69, 0x66, 0x20,
- 0x20, 0x20, 0x20, 0x20, 0x20, 0x72, 0x65, 0x74,
+ 0x28, 0x6e, 0x20, 0x3d, 0x3d, 0x20, 0x31, 0x29,
- 0x75, 0x72, 0x6e, 0x20, 0x31, 0x3b, 0x0a, 0x20,
+ 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
- 0x20, 0x20, 0x20, 0x65, 0x6c, 0x73, 0x65, 0x0a,
+ 0x20, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20,
- 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
+ 0x31, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x65,
- 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x20, 0x66,
+ 0x6c, 0x73, 0x65, 0x0a, 0x20, 0x20, 0x20, 0x20,
- 0x69, 0x62, 0x28, 0x6e, 0x20, 0x2d, 0x20, 0x31,
+ 0x20, 0x20, 0x20, 0x20, 0x72, 0x65, 0x74, 0x75,
- 0x29, 0x20, 0x2b, 0x20, 0x66, 0x69, 0x62, 0x28,
+ 0x72, 0x6e, 0x20, 0x66, 0x69, 0x62, 0x28, 0x6e,
- 0x6e, 0x20, 0x2d, 0x20, 0x32, 0x29, 0x3b, 0x0a,
+ 0x20, 0x2d, 0x20, 0x31, 0x29, 0x20, 0x2b, 0x20,
- 0x7d, 0x08, 0xe9, 0x05, 0xbe, 0x00, 0xe0, 0x29,
+ 0x66, 0x69, 0x62, 0x28, 0x6e, 0x20, 0x2d, 0x20,
- 0x06, 0x2e, 0xb2, 0x03, 0x01, 0x01, 0x06, 0x01,
+ 0x32, 0x29, 0x3b, 0x0a, 0x7d, 0x08, 0xe9, 0x05,
- 0x01, 0x00, 0x07, 0x14, 0x02, 0x00,
+ 0xbe, 0x00, 0xe0, 0x29, 0x06, 0x2e, 0xb2, 0x03,
+ 0x01, 0x01, 0x00, 0x00,
 };
 
-const uint32_t qjsc_hello_module_size = 177;
+const uint32_t qjsc_hello_module_size = 191;
 
-const uint8_t qjsc_hello_module[177] = {
+const uint8_t qjsc_hello_module[191] = {
  0x0c, 0x07, 0x30, 0x65, 0x78, 0x61, 0x6d, 0x70,
  0x6c, 0x65, 0x73, 0x2f, 0x68, 0x65, 0x6c, 0x6c,
  0x6f, 0x5f, 0x6d, 0x6f, 0x64, 0x75, 0x6c, 0x65,
@@ -69,9 +70,10 @@ const uint8_t qjsc_hello_module[177] = {
  0x00, 0x00, 0x00, 0x42, 0xdd, 0x00, 0x00, 0x00,
  0x04, 0xdf, 0x00, 0x00, 0x00, 0x65, 0x00, 0x00,
  0xbb, 0x0a, 0xee, 0x24, 0x02, 0x00, 0x0e, 0x06,
- 0x2e, 0xb2, 0x03, 0x01, 0x01, 0x0a, 0x01, 0x01,
+ 0x2e, 0xb2, 0x03, 0x01, 0x01, 0x18, 0x00, 0x04,
- 0x00, 0x04, 0x0a, 0x02, 0x62, 0x00, 0x4d, 0x30,
+ 0x08, 0x00, 0x1b, 0x10, 0x1b, 0x08, 0x1b, 0x07,
- 0x00,
+ 0x17, 0x0f, 0x1b, 0x10, 0x1b, 0x08, 0x1b, 0x18,
+ 0x11, 0x08, 0x0c, 0x07, 0x07, 0x1f, 0x00,
 };
 
 static JSContext *JS_NewCustomContext(JSRuntime *rt)

gen/test_fib.c

@@ -2,9 +2,9 @@
 
 #include "quickjs-libc.h"
 
-const uint32_t qjsc_test_fib_size = 166;
+const uint32_t qjsc_test_fib_size = 180;
 
-const uint8_t qjsc_test_fib[166] = {
+const uint8_t qjsc_test_fib[180] = {
  0x0c, 0x07, 0x28, 0x65, 0x78, 0x61, 0x6d, 0x70,
  0x6c, 0x65, 0x73, 0x2f, 0x74, 0x65, 0x73, 0x74,
  0x5f, 0x66, 0x69, 0x62, 0x2e, 0x6a, 0x73, 0x10,
@@ -24,8 +24,10 @@ const uint8_t qjsc_test_fib[166] = {
  0x42, 0xdd, 0x00, 0x00, 0x00, 0x04, 0xdf, 0x00,
  0x00, 0x00, 0x65, 0x00, 0x00, 0xbb, 0x0a, 0xee,
  0x24, 0x02, 0x00, 0x0e, 0x06, 0x2e, 0xb2, 0x03,
- 0x01, 0x01, 0x0a, 0x01, 0x01, 0x00, 0x04, 0x0a,
+ 0x01, 0x01, 0x18, 0x00, 0x04, 0x08, 0x00, 0x1b,
- 0x02, 0x62, 0x00, 0x4d, 0x30, 0x00,
+ 0x10, 0x1b, 0x08, 0x1b, 0x07, 0x17, 0x0f, 0x1b,
+ 0x10, 0x1b, 0x08, 0x1b, 0x18, 0x11, 0x08, 0x0c,
+ 0x07, 0x07, 0x1f, 0x00,
 };
 
 static JSContext *JS_NewCustomContext(JSRuntime *rt)

tests/test_builtin.js

@@ -6,12 +6,12 @@ function test_exception_source_pos()
     var e;
 
     try {
-        throw new Error(""); // line 9, column 19
+        throw new Error(""); // line 9, column 15, token 'new'
     } catch(_e) {
         e = _e;
     }
-
+    // XXX: Should be the position of the `new` keyword or the `Error` constructor name ?
-    assert(e.stack.includes("test_builtin.js:9:19"));
+    assert(e.stack.includes("test_builtin.js:9:15"), true, "expected test_builtin.js:9:15, got\n" + e.stack);
 }
 
 // Keep this at the top; it tests source positions.
@@ -19,9 +19,9 @@ function test_function_source_pos() // line 18, column 1
 {
     function inner() {} // line 20, column 5
     var f = eval("function f() {} f");
-    assert(`${test_function_source_pos.lineNumber}:${test_function_source_pos.columnNumber}`, "18:1");
+    assert(`${test_function_source_pos.lineNumber}:${test_function_source_pos.columnNumber}`, "18:1", "invalid test_function_source_pos function position");
-    assert(`${inner.lineNumber}:${inner.columnNumber}`, "20:5");
+    assert(`${inner.lineNumber}:${inner.columnNumber}`, "20:5", "invalid inner function position");
-    assert(`${f.lineNumber}:${f.columnNumber}`, "1:1");
+    assert(`${f.lineNumber}:${f.columnNumber}`, "1:1", "invalid f function position");
 }
 
 // Keep this at the top; it tests source positions.
@@ -35,18 +35,18 @@ function test_exception_prepare_stack()
     };
 
     try {
-        throw new Error(""); // line 38, column 19
+        throw new Error(""); // line 38, column 15, token 'new'
     } catch(_e) {
         e = _e;
     }
 
-    assert(e.stack.length === 2);
+    assert(e.stack.length, 2, "e.stack.length");
     const f = e.stack[0];
-    assert(f.getFunctionName() === 'test_exception_prepare_stack');
+    assert(f.getFunctionName(), 'test_exception_prepare_stack', 'f.getFunctionName()');
-    assert(f.getFileName() === 'tests/test_builtin.js');
+    assert(f.getFileName(), 'tests/test_builtin.js', 'f.getFileName()');
-    assert(f.getLineNumber() === 38);
+    assert(f.getLineNumber(), 38, 'f.getLineNumber()');
-    assert(f.getColumnNumber() === 19);
+    assert(f.getColumnNumber(), 15, 'f.getColumnNumber()');
-    assert(!f.isNative());
+    assert(f.isNative(), false, 'f.isNative()');
 
     Error.prepareStackTrace = undefined;
 }
@@ -63,27 +63,36 @@ function test_exception_stack_size_limit()
     };
 
     try {
-        throw new Error(""); // line 66, column 19
+        throw new Error(""); // line 66, column 15, token 'new'
     } catch(_e) {
         e = _e;
     }
 
-    assert(e.stack.length === 1);
+    assert(e.stack.length, 1, 'e.stack.length');
     const f = e.stack[0];
-    assert(f.getFunctionName() === 'test_exception_stack_size_limit');
+    assert(f.getFunctionName(), 'test_exception_stack_size_limit', 'f.getFunctionName()');
-    assert(f.getFileName() === 'tests/test_builtin.js');
+    assert(f.getFileName(), 'tests/test_builtin.js', 'f.getFileName()');
-    assert(f.getLineNumber() === 66);
+    assert(f.getLineNumber(), 66, 'f.getLineNumber()');
-    assert(f.getColumnNumber() === 19);
+    assert(f.getColumnNumber(), 15, 'f.getColumnNumber()');
-    assert(!f.isNative());
+    assert(f.isNative(), false, 'f.isNative()');
 
     Error.stackTraceLimit = 10;
     Error.prepareStackTrace = undefined;
 }
 
+function value_string(o) {
+    if (typeof o === 'object' && o !== null)
+        return o.toString();
+    else
+        return "" + o;
+}
+
 function assert(actual, expected, message) {
     if (arguments.length == 1)
         expected = true;
 
+    message = (arguments.length >= 3) ? " (" + message + ")" : "";
+
     if (typeof actual === typeof expected) {
         if (actual === expected) {
             if (actual !== 0 || (1 / actual) === (1 / expected))
@@ -100,9 +109,9 @@ function assert(actual, expected, message) {
                 return;
         }
     }
-    throw Error("assertion failed: got |" + actual + "|" +
+    throw Error("assertion failed: " +
-                ", expected |" + expected + "|" +
+                "got |" + value_string(actual) + "|, " +
-                (message ? " (" + message + ")" : ""));
+                "expected |" + value_string(expected) + "|" + message);
 }
 
 function assert_throws(expected_error, func)
@@ -160,16 +169,16 @@ function test_function()
     }));
 
     r = new Function("a", "b", "return a + b;");
-    assert(r(2,3), 5, "function");
+    assert(r(2,3), 5, 'r(2,3)');
 
     g = f.bind(1, 2);
-    assert(g.length, 1);
+    assert(g.length, 1, 'g.length');
-    assert(g.name, "bound f");
+    assert(g.name, "bound f", 'g.name');
-    assert(g(3), [1,2,3]);
+    assert(g(3), [1,2,3], 'g(3)');
 
     g = constructor1.bind(null, 1);
     r = new g();
-    assert(r.x, 1);
+    assert(r.x, 1, 'r.x');
 }
 
 function test()

v8.txt

@@ -105,7 +105,7 @@ async function two(x) {
 === compare-table-sne.js
 === console.js
 TypeError: not a function
-    at <eval> (console.js:5:1)
+    at <eval> (console.js:5:9)
 
 === constant-folding.js
 === context-variable-assignments.js
@@ -186,10 +186,10 @@ TypeError: not a function
 === external-backing-store-gc.js
 === extra-arguments.js
 TypeError: cannot read property 'length' of undefined
-    at g (extra-arguments.js:35:23)
+    at g (extra-arguments.js:35:29)
     at f (extra-arguments.js:29:10)
     at apply (native)
-    at <eval> (extra-arguments.js:51:40)
+    at <eval> (extra-arguments.js:51:28)
 
 === extra-commas.js
 === for-in-delete.js
@@ -399,6 +399,26 @@ found:
 === json-errors.js
 Failure:
 expected:
+"Unexpected end of JSON input"
+found:
+"Unterminated string in JSON at position 7 (line 1 column 8)"
+Failure:
+expected:
+"Unexpected end of JSON input"
+found:
+"Unterminated string in JSON at position 8 (line 1 column 9)"
+Failure:
+expected:
+"Unexpected end of JSON input"
+found:
+"Unterminated string in JSON at position 5 (line 1 column 6)"
+Failure:
+expected:
+"Unexpected end of JSON input"
+found:
+"Unterminated string in JSON at position 6 (line 1 column 7)"
+Failure:
+expected:
 "Unexpected token \n in JSON at position 3"
 found:
 "Bad control character in string literal in JSON at position 3 (line 1 column 4)"
@@ -518,7 +538,7 @@ Failure: expected <["bbaa","a","","a"]> found <["abba","bba","b","a"]>
 === regexp-global.js
 SyntaxError: too many captures
     at RegExp (native)
-    at <eval> (regexp-global.js:169:36)
+    at <eval> (regexp-global.js:169:14)
 
 === regexp-lastIndex.js
 === regexp-lookahead.js
@@ -567,7 +587,7 @@ Failure:
 expected:
 "bar"
 found:
-"    at <anonymous> (stack-traces-custom-lazy.js:47:46)\n    at testPrepareStackTrace (stack-traces-custom-lazy.js:31:5)\n    at <eval> (stack-traces-custom-lazy.js:47:60)\n"
+"    at <anonymous> (stack-traces-custom-lazy.js:47:42)\n    at testPrepareStackTrace (stack-traces-custom-lazy.js:31:5)\n    at <eval> (stack-traces-custom-lazy.js:47:1)\n"
 Failure:
 expected:
 "bar"
@@ -575,7 +595,7 @@ found:
 "    at f (stack-traces-custom-lazy.js:48:38)\n    at f (stack-traces-custom-lazy.js:48:38)\n    at f (stack-traces-custom-lazy.js:48:38)\n    at f (stack-traces-custom-lazy.js:48:38)\n    at f (stack-traces-custom-lazy.js:48:38)\n    at f (stack-traces-custom-lazy.js
 === stack-traces-custom.js
 TypeError: not a function
-    at <eval> (stack-traces-custom.js:20:21)
+    at <eval> (stack-traces-custom.js:20:31)
 
 === stack-traces-overflow.js
 Failure: expected <true> found <false>
@@ -584,120 +604,120 @@ Failure: expected <undefined> found <"">
 === stack-traces.js
 Failure (testArrayNative doesn't contain expected[0] stack =     at <anonymous> (stack-traces.js:48:31)
     at map (native)
-    at testArrayNative (stack-traces.js:48:37)
+    at testArrayNative (stack-traces.js:48:13)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:267:47)
+    at <eval> (stack-traces.js:267:1)
 ): expected <true> found <false>
 Failure (testMethodNameInference doesn't contain expected[0] stack =     at <anonymous> (stack-traces.js:30:37)
-    at testMethodNameInference (stack-traces.js:31:8)
+    at testMethodNameInference (stack-traces.js:31:13)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:269:63)
+    at <eval> (stack-traces.js:269:1)
 ): expected <true> found <false>
 Failure (testImplicitConversion doesn't contain expected[0] stack =     at <anonymous> (stack-traces.js:53:42)
-    at testImplicitConversion (stack-traces.js:54:19)
+    at testImplicitConversion (stack-traces.js:54:12)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:270:61)
+    at <eval> (stack-traces.js:270:1)
 ): expected <true> found <false>
-Failure (testEval doesn't contain expected[0] stack =     at Doo (<input>:1:17)
+Failure (testEval doesn't contain expected[0] stack =     at Doo (<input>:1:18)
-    at <eval> (<input>:1:26)
+    at <eval> (<input>:1:27)
     at testEval (stack-traces.js:58:3)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:271:33)
+    at <eval> (stack-traces.js:271:1)
 ): expected <true> found <false>
 Failure (testNestedEval doesn't contain expected[0] stack =     at <eval> (<input>:1:1)
-    at Inner (<input>:1:19)
+    at Inner (<input>:1:20)
-    at Outer (<input>:1:58)
+    at Outer (<input>:1:59)
-    at <eval> (<input>:1:70)
+    at <eval> (<input>:1:71)
     at testNestedEval (stack-traces.js:63:3)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:272:45)
+    at <eval> (stack-traces.js:272:1)
-):
+): 
-Failure (testEvalWithSourceURL doesn't contain expected[0] stack =     at Doo (<input>:1:17)
+Failure (testEvalWithSourceURL doesn't contain expected[0] stack =     at Doo (<input>:1:18)
-    at <eval> (<input>:1:26)
+    at <eval> (<input>:1:27)
     at testEvalWithSourceURL (stack-traces.js:67:3)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:274:34)
+    at <eval> (stack-traces.js:273:1)
 ): expected <true> found <false>
 Failure (testNestedEvalWithSourceURL doesn't contain expected[0] stack =     at <eval> (<input>:1:1)
-    at Inner (<input>:1:19)
+    at Inner (<input>:1:20)
-    at Outer (<input>:1:36)
+    at Outer (<input>:1:37)
-    at <eval> (<input>:1:48)
+    at <eval> (<input>:1:49)
     at testNestedEvalWithSourceURL (stack-traces.js:73:3)
     at testTrace (stack-traces.js:162:5)
     at <eval> (
 Failure (testNestedEvalWithSourceURL doesn't contain expected[1] stack =     at <eval> (<input>:1:1)
-    at Inner (<input>:1:19)
+    at Inner (<input>:1:20)
-    at Outer (<input>:1:36)
+    at Outer (<input>:1:37)
-    at <eval> (<input>:1:48)
+    at <eval> (<input>:1:49)
     at testNestedEvalWithSourceURL (stack-traces.js:73:3)
     at testTrace (stack-traces.js:162:5)
     at <eval> (
 Failure (testValue doesn't contain expected[0] stack =     at <anonymous> (stack-traces.js:77:47)
-    at testValue (stack-traces.js:78:3)
+    at testValue (stack-traces.js:78:7)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:278:35)
+    at <eval> (stack-traces.js:278:1)
 ): expected <true> found <false>
 Failure (testConstructor doesn't contain expected[0] stack =     at Plonk (stack-traces.js:82:22)
-    at testConstructor (stack-traces.js:83:7)
+    at testConstructor (stack-traces.js:83:3)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:279:47)
+    at <eval> (stack-traces.js:279:1)
 ): expected <true> found <false>
 Failure (testRenamedMethod doesn't contain expected[0] stack =     at a$b$c$d (stack-traces.js:87:31)
-    at testRenamedMethod (stack-traces.js:90:8)
+    at testRenamedMethod (stack-traces.js:90:16)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:280:51)
+    at <eval> (stack-traces.js:280:1)
 ): expected <true> found <false>
 Failure (testAnonymousMethod doesn't contain expected[0] stack =     at <anonymous> (stack-traces.js:94:18)
     at call (native)
-    at testAnonymousMethod (stack-traces.js:94:38)
+    at testAnonymousMethod (stack-traces.js:94:26)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:281:55)
+    at <eval> (stack-traces.js:281:1)
 ): expected <true> found <false>
 Failure (testFunctionName doesn't contain expected[2] stack =     at foo_0 (stack-traces.js:101:9)
-    at foo_1 (stack-traces.js:103:27)
+    at foo_1 (stack-traces.js:103:29)
-    at <anonymous> (stack-traces.js:103:27)
+    at <anonymous> (stack-traces.js:103:29)
-    at boo_3 (stack-traces.js:103:27)
+    at boo_3 (stack-traces.js:103:29)
-    at <anonymous> (stack-traces.js:103:27)
+    at <anonymous> (stack-traces.js:103:29)
     at testFunctionName (stack-traces
 Failure (testFunctionName doesn't contain expected[4] stack =     at foo_0 (stack-traces.js:101:9)
-    at foo_1 (stack-traces.js:103:27)
+    at foo_1 (stack-traces.js:103:29)
-    at <anonymous> (stack-traces.js:103:27)
+    at <anonymous> (stack-traces.js:103:29)
-    at boo_3 (stack-traces.js:103:27)
+    at boo_3 (stack-traces.js:103:29)
-    at <anonymous> (stack-traces.js:103:27)
+    at <anonymous> (stack-traces.js:103:29)
     at testFunctionName (stack-traces
-Failure (testDefaultCustomError doesn't contain expected[0] stack =     at CustomError (stack-traces.js:130:33)
+Failure (testDefaultCustomError doesn't contain expected[0] stack =     at CustomError (stack-traces.js:130:9)
-    at testDefaultCustomError (stack-traces.js:138:36)
+    at testDefaultCustomError (stack-traces.js:138:9)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:287:5)
+    at <eval> (stack-traces.js:285:1)
 ): expected <true> found <false>
-Failure (testDefaultCustomError doesn't contain expected[1] stack =     at CustomError (stack-traces.js:130:33)
+Failure (testDefaultCustomError doesn't contain expected[1] stack =     at CustomError (stack-traces.js:130:9)
-    at testDefaultCustomError (stack-traces.js:138:36)
+    at testDefaultCustomError (stack-traces.js:138:9)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:287:5)
+    at <eval> (stack-traces.js:285:1)
 ): expected <true> found <false>
-Failure (testStrippedCustomError doesn't contain expected[0] stack =     at CustomError (stack-traces.js:130:33)
+Failure (testStrippedCustomError doesn't contain expected[0] stack =     at CustomError (stack-traces.js:130:9)
-    at testStrippedCustomError (stack-traces.js:142:36)
+    at testStrippedCustomError (stack-traces.js:142:9)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:289:25)
+    at <eval> (stack-traces.js:288:1)
 ): expected <true> found <false>
 Failure (testClassNames doesn't contain expected[0] stack =     at MyObj (stack-traces.js:145:22)
-    at <anonymous> (stack-traces.js:150:14)
+    at <anonymous> (stack-traces.js:150:10)
-    at testClassNames (stack-traces.js:154:8)
+    at testClassNames (stack-traces.js:154:22)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:291:49)
+    at <eval> (stack-traces.js:290:1)
 ): expected <true> found <false>
 Failure (testClassNames doesn't contain expected[1] stack =     at MyObj (stack-traces.js:145:22)
-    at <anonymous> (stack-traces.js:150:14)
+    at <anonymous> (stack-traces.js:150:10)
-    at testClassNames (stack-traces.js:154:8)
+    at testClassNames (stack-traces.js:154:22)
     at testTrace (stack-traces.js:162:5)
-    at <eval> (stack-traces.js:291:49)
+    at <eval> (stack-traces.js:290:1)
 ): expected <true> found <false>
 Failure (UnintendedCallerCensorship didn't contain new ReferenceError): expected <true> found <false>
 Failure: expected <"abc"> found <undefined>
-Failure: expected <"abc"> found <"    at <eval> (stack-traces.js:371:13)\n">
+Failure: expected <"abc"> found <"    at <eval> (stack-traces.js:371:9)\n">
-Failure: expected <undefined> found <"    at <eval> (stack-traces.js:375:13)\n">
+Failure: expected <undefined> found <"    at <eval> (stack-traces.js:375:9)\n">
 TypeError: not a function
-    at <eval> (stack-traces.js:381:1)
+    at <eval> (stack-traces.js:381:7)
 
 === str-to-num.js
 Failure: expected <7.922816251426436e+28> found <7.922816251426434e+28>
@@ -726,15 +746,15 @@ Failure: expected <null> found <undefined>
 Failure: expected <null> found <undefined>
 Failure: expected <null> found <undefined>
 TypeError: cannot read property 'value' of undefined
-    at <anonymous> (strict-mode.js:1213:58)
+    at <anonymous> (strict-mode.js:1213:68)
     at recurse (strict-mode.js:1207:14)
-    at non_strict (strict-mode.js:1214:5)
+    at non_strict (strict-mode.js:1212:12)
     at strict (strict-mode.js:1199:15)
     at <anonymous> (strict-mode.js:1218:43)
     at recurse (strict-mode.js:1207:14)
-    at test (strict-mode.js:1218:54)
+    at test (strict-mode.js:1218:12)
     at TestNonStrictFunctionCallerDescriptorPill (strict-mode.js:1222:22)
-    at <eval> (strict-mode.js:1224:1)
+    at <eval> (strict-mode.js:1195:1)
 
 === string-add.js
 === string-charat.js