Created attachment 48842 [details]
Minimal bug reproduction code

Attached code compiled with:

g++-10 (Ubuntu 10.1.0-2ubuntu1~18.04) 10.1.0

with compile line:
g++-10 Const_Violation_Silent_Error.cpp -o Const_Violation_Silent_Error

compiles whereas g++-9 (g++-9 (Ubuntu 9.3.0-11ubuntu0~18.04.1) 9.3.0) correctly refuses to with error:

error: binding reference of type ‘dummy&’ to ‘const dummy’ discards qualifiers...

Not only does this code compile when it should not, but it will simply quietly never enter Modify_Object().

Copy of attached code:

struct dummy{
	int int_param;
};

inline void Modify_Object(dummy &object){
	object.int_param=0;
}

template <bool is_learning=true> void Templated_Function(){
	const dummy R{0};
	Modify_Object(R);
}

int main(){
	Templated_Function();
}