when emulation fails due to invalid_read, explain where

[williballenthin]

in the output produced by run_speakeasy, i see a line like the following, which seems to indicate the end of emulation:

0x18000abef: 'kernel32.GetTickCount()' -> 0x5265cc8
export.Foo: Caught error: invalid_read

where is the faulting instruction? what led up to it? what address could not be read? this would help me triage issues with the emulator and the sample i'm analyzing.