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Parsing markers/requirements fails with pyparsing 3.0.5 #486

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#489
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Parsing markers/requirements fails with pyparsing 3.0.5#486
#489
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bugpackaging.markerspackaging.requirements
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opened on Nov 9, 2021

Pyparsing 3.0.5 changes the private API around originalTextFor, causing code in packaging that uses the private API to break:

packaging/packaging/requirements.py

Lines 69 to 72 in 8cb9dbf

MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
MARKER_EXPR.setParseAction(
lambda s, l, t: Marker(s[t._original_start : t._original_end])
)

This manifests as a failure in safety.

Reproduction:

from packaging.requirements import Requirement

Requirement('alabaster==0.7.12; python_version >= "3.6"\n')

The upstream issue is pyparsing/pyparsing#110 (comment)

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