So I wrote a very basic CommandLineToolSet (please! save me and
suggest a better name!). It can "debug" errors by dumping a stack
trace to stderr and kill the image.

So now the CI tests use this, and the following tests fail:

ToolsTests.Browser.BrowseTest.testBrowseClass
ToolsTests.Browser.BrowseTest.testBrowseHierarchyClass
ToolsTests.Browser.BrowseTest.testBrowseHierarchyInstance
ToolsTests.Browser.BrowseTest.testBrowseHierarchyMataclass
ToolsTests.Browser.BrowseTest.testBrowseInstance
ToolsTests.Browser.BrowseTest.testBrowseMetaclass
ToolsTests.Browser.DependencyBrowserTest.testBrowse
ToolsTests.Inspector.WeakSetInspectorTest.testSymbolTableM6812

That's because these tests actually want the StandardToolSet. One idea
that occurs to me is to use a #setUp/#tearDown combo to re-set the
ToolSet. That comes at the risk of things blowing up in a test causing
CI jobs to hang; the very reason I wrote the CommandLineToolSet.

So before I do that, any other ideas? Essentially I'm looking for a
scoped ToolSet change. I think?

frank