Some code for introspection.

Used strict to demonstrate clean approaches

  DB<80> package ABC::Foo; our $User='talexb'
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> Well you could inspect the package stash(es) instead of using eval. *

  DB<81> use strict;print ${ $main::{"ABC::"}{"Foo::"}{User} }
talexb
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> Another approach without eval is using symbolic refs, you need to locally no strict 'refs'; for that.

  DB<82> use strict; no strict 'refs'; print ${ 'ABC::Foo::User' }
talexb
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*) NB: you could also avoid the main:: stash and hardcode

  DB<99> use strict;print ${ $ABC::{"Foo::"}{User} }
talexb
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if ABC is static in your code.