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Ticket UUID:	934e6eb9cf15782433ffbc2f56cecdac30c596f5
Title:	ensemble unknown handler confused by tailcall
Type:	Bug	Created on:	2020-01-03 20:04:41
Submitter:	pooryorick	Assigned to:	nobody
Subsystem:	21. [namespace]	Severity:	Important
Priority:	5 Medium	Last modified:	2021-06-21 06:47:43
Status:	Open	Closed by:	nobody
Resolution:	None	Closed on:
Version:

Description:

tailcall confuses the unknown handler of a namespace ensemble. The following script,

namespace eval ns1 {
    proc dispatch {routine args} {
        return list
    }
    namespace ensemble create -unknown [
    list ::apply [list {ensemble routine args} {
        tailcall dispatch $routine {*}$args
    } [namespace current]]]
}

puts [ns1 x one two three]

results in the error:

unknown subcommand "x": namespace ::ns1 does not export any commands

However, if the word "tailcall" is removed, then the result is as expected:

one two three