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-rw-r--r--frontends/ast/ast.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/frontends/ast/ast.cc b/frontends/ast/ast.cc
index ec9616be..6ac77144 100644
--- a/frontends/ast/ast.cc
+++ b/frontends/ast/ast.cc
@@ -51,7 +51,7 @@ namespace AST_INTERNAL {
bool flag_dump_ast1, flag_dump_ast2, flag_dump_vlog, flag_nolatches, flag_nomem2reg, flag_mem2reg, flag_lib, flag_noopt, flag_icells, flag_autowire;
AstNode *current_ast, *current_ast_mod;
std::map<std::string, AstNode*> current_scope;
- std::map<RTLIL::SigBit, RTLIL::SigBit> *genRTLIL_subst_ptr = NULL;
+ const std::map<RTLIL::SigBit, RTLIL::SigBit> *genRTLIL_subst_ptr = NULL;
RTLIL::SigSpec ignoreThisSignalsInInitial;
AstNode *current_top_block, *current_block, *current_block_child;
AstModule *current_module;