[iced3] Use source-map-support for stack trace formatting

Cakefile

@@ -449,7 +449,7 @@ runTests = (CoffeeScript) ->
 
   # End Iced additions
   # ----
-  
+
   helpers.extend global, require './test/support/helpers'
 
   # When all the tests have run, collect and print errors.
@@ -519,6 +519,10 @@ task 'test:browser', 'run the test suite against the merged browser script', ->
   result = {}
   global.testingBrowser = yes
   (-> eval source).call result
+  # When testing browser build, install custom prepareStackTrace handler instead
+  # of source-map-support. `CoffeeScript.run` is pulled from `browser.coffee` in
+  # browser build, and it's incompatible with our source-map-support hooks.
+  result.CoffeeScript.installPrepareStackTrace()
   testResults = runTests result.CoffeeScript
 
 task 'check_version', 'Check version between package.json and version compiled in', ->

README.md

@@ -78,3 +78,27 @@ For documentation, usage, and examples, see: http://coffeescript.org/
 To suggest a feature or report a bug: http://github.com/maxtaco/coffeescript/issues
 
 The source repository: https://github.com/maxtaco/coffeescript.git
+
+## Note about `source-map-support`
+
+Since v112.8.1 (2019-12-20), IcedCoffeeScript v3 uses `source-map-support`
+package to handle location mapping for stack traces for errors coming from
+IcedCoffeeScript code. It's enabled by default when using `iced3` to run scripts
+or when using `register` to enable IcedCoffeeScript in Node's module system.
+
+To enable it manually (e.g. in environments other than Node.js or when not
+using `register`), use the following API:
+
+```
+require('iced-coffee-script-3').installSourceMapSupport({})
+```
+
+This function can also be called with options for `source-map-support` instead
+of an empty object. Available options are described in `source-map-support`
+README file.
+
+To use the old error handler, use the following API instead:
+
+```
+require('iced-coffee-script-3').installPrepareStackTrace()
+```