Another stack trace difference, not yet suppressed. Should it be?

# Minimized program:
__v_2 = { get() { return 42 } };
__v_4 = new Proxy(function() { "use strict"; return this }, __v_2);
__v_2 < __v_4


# Compared default with ignition

# Flags of default:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=364 --random-seed -1989169247
# Flags of ignition:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=364 --random-seed -1989169247 --ignition

Difference:
- out4_m/fuzz-03461.js.minimized:3: TypeError: '42' returned for property 'Symbol(Symbol.toPrimitive)' of object '[object Function]' is not a function
+ out4_m/fuzz-03461.js.minimized:3: TypeError: number is not a function

### Start of configuration default:
out4_m/fuzz-03461.js.minimized:3: TypeError: '42' returned for property 'Symbol(Symbol.toPrimitive)' of object '[object Function]' is not a function
__v_2 < __v_4
      ^
TypeError: '42' returned for property 'Symbol(Symbol.toPrimitive)' of object '[object Function]' is not a function
    at out4_m/fuzz-03461.js.minimized:3:7


### End of configuration default

### Start of configuration ignition:
out4_m/fuzz-03461.js.minimized:3: TypeError: number is not a function
__v_2 < __v_4
      ^
TypeError: number is not a function
    at out4_m/fuzz-03461.js.minimized:3:7


### End of configuration ignition

A similar case:

# Minimized program:
var __v_0 = {};
try {
function* g() {
  __f_1();
}
function* f() {
  yield* g();
}
} catch(e) {; }
function __f_1() {
  __v_0.setListener();
}
for (let _ of f()) { }

# Difference:
- out4_m/fuzz-04983.js.minimized:11: TypeError: __v_0.setListener is not a function
+ out4_m/fuzz-04983.js.minimized:11: TypeError: undefined is not a function

Another case that might just need better suppression. Right now it's not suppressed.

# Minimized program:
__v_4 = `postMessage('Starting worker');
  switch (__v_0++) {
  };`;
var __v_9 = new Worker(__v_4);


# Compared default with ignition_staging

# Flags of default:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=184 --expose-wasm --random-seed -1964896105
# Flags of ignition_staging:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=184 --expose-wasm --random-seed -1964896105 --ignition-staging

Difference:
- unnamed:42: Uncaught ReferenceError: __v_0 is not defined
+ unnamed:0: Uncaught ReferenceError: __v_0 is not defined

### Start of configuration default:
unnamed:42: Uncaught ReferenceError: __v_0 is not defined
unnamed:2: ReferenceError: __v_0 is not defined
  switch (__v_0++) {
          ^
ReferenceError: __v_0 is not defined
    at unnamed:2:11


### End of configuration default

### Start of configuration ignition_staging:
unnamed:0: Uncaught ReferenceError: __v_0 is not defined
unnamed:1: ReferenceError: __v_0 is not defined
postMessage('Starting worker');
^
ReferenceError: __v_0 is not defined
    at unnamed:1:1


### End of configuration ignition_staging

Yet another case. I'm currently suppressing everything I report here:

# Minimized program:
try {
  eval("new parseInt(~true)")
} catch (e) { print (e.message); };

# Compared default with noturbo

# Flags of default:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=436 --ignition-staging --turbo --always-opt --random-seed -809530293
# Flags of noturbo:
--abort_on_stack_overflow --expose-gc --allow-natives-syntax --invoke-weak-callbacks --omit-quit --gc-interval=436 --ignition-staging --turbo --always-opt --random-seed -809530293 --turbo-filter=~

Difference:
- parseInt is not a function
+ parseInt is not a constructor

### Start of configuration default:
parseInt is not a function

### End of configuration default

### Start of configuration noturbo:
parseInt is not a constructor

### End of configuration noturbo

Yang - I remember there were changes which went in to allow V8 to print better output for calling a non-function. Some of the diffs here seem related, e.g.: 

- out4_m/fuzz-04983.js.minimized:11: TypeError: __v_0.setListener is not a function
+ out4_m/fuzz-04983.js.minimized:11: TypeError: undefined is not a function

Do you have knowledge of the code which does this. Any ideas why Ignition might not be doing it?

None of this repros anymore with our current comparison settings. Can we set this to Wontfix?

Yes, WontFix it is. :)