I got this when I restarted drscheme after building it from scratch:
> Error invoking tool #<path:/Users/matthias/plt/collects/slideshow>;("tool.ss")
>
> reference to an identifier before its definition:
> provide/contract-contract-id-Row-pats.7 in module:
> "/Users/matthias/plt/collects/scheme/match/patterns.ss" phase: 1
>
> === context ===
> /Users/matthias/plt/collects/scheme/match/reorder.ss: [running body]
> /Users/matthias/plt/collects/drscheme/private/tools.ss:265:4
> /Users/matthias/plt/collects/scheme/private/map.ss:50:17: loop
> /Users/matthias/plt/collects/drscheme/private/tools.ss:62:0:
> load/invoke-all-tools
> /Users/matthias/plt/collects/drscheme/tool-lib.ss: [running body]
> /Users/matthias/plt/collects/drscheme/private/drscheme-normal.ss: [running
> body]
> /Users/matthias/plt/collects/drscheme/drscheme.ss: [running body]
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