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from sympy.external import import_module
from sympy.testing.pytest import ignore_warnings, raises
antlr4 = import_module("antlr4", warn_not_installed=False)
# disable tests if antlr4-python3-runtime is not present
if antlr4:
disabled = True
def test_no_import():
from sympy.parsing.latex import parse_latex
with ignore_warnings(UserWarning):
with raises(ImportError):
parse_latex('1 + 1')
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