[plt-scheme] Help understanding line numbers in error.

Hi,
I'm wondering if someone would mind explaining how to read this error
message.

---------------------------------------------------------------------------------------------------------------
> reference to undefined identifier: all-regs

 === context ===
/Users/patrickli_2001/Documents/Scheme/compiler.ss:330:0:
compile-procedure-call
/Users/patrickli_2001/Documents/Scheme/compiler.ss:283:0:
compile-application
/Users/patrickli_2001/Documents/Scheme/compiler.ss:210:0: compile-if
/Users/patrickli_2001/Documents/Scheme/compiler.ss:268:0:
compile-lambda-body
/Users/patrickli_2001/Documents/Scheme/compiler.ss:252:0: compile-lambda
/Users/patrickli_2001/Documents/Scheme/compiler.ss:192:0: compile-definition
/Applications/plt-scheme/collects/scheme/private/misc.ss:74:7
/Applications/plt-scheme/collects/r5rs/run.ss: [running body]
---------------------------------------------------------------------------------------------------------------

Which is caused by loading the attached file.

The cause of the error itself is very clear. all-regs has not been defined
anywhere. But I don't understand what the "context" means.

The only place all-regs is used, is in the function compile-proc-appl which
stars at line 356. But this isn't mentioned anywhere in the context
information.

(I'm running mzscheme from emac's scheme mode)

Thanks for your help
  -Patrick
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