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PR analyzer/93405 reports an ICE with -fanalyzer when passing a constant "by reference" in gfortran. The issue is that the constant is passed as an ADDR_EXPR of a CONST_DECL, and region_model::get_lvalue_1 doesn't know how to handle CONST_DECL. This patch implements it for CONST_DECL by providing a placeholder region, holding the CONST_DECL's value, fixing the ICE. gcc/analyzer/ChangeLog: PR analyzer/93405 * region-model.cc (region_model::get_lvalue_1): Implement CONST_DECL. gcc/testsuite/ChangeLog: PR analyzer/93405 * gfortran.dg/analyzer/pr93405.f90: New test.
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