Fix unreachable code coverage

src/language/node_processor/AffectationProcessor.hpp

@@ -133,7 +133,9 @@ class AffectationExecutor final : public IAffectationExecutor
                     if constexpr (std::is_convertible_v<Vi_T, double>) {
                       m_lhs[i] = vi;
                     } else {
+                      // LCOV_EXCL_START
                       throw UnexpectedError("unexpected rhs type in affectation");
+                      // LCOV_EXCL_STOP
                     }
                   },
                   v[i]);
@@ -145,7 +147,9 @@ class AffectationExecutor final : public IAffectationExecutor
                   if constexpr (std::is_convertible_v<Vi_T, double>) {
                     m_lhs = v;
                   } else {
+                    // LCOV_EXCL_START
                     throw UnexpectedError("unexpected rhs type in affectation");
+                    // LCOV_EXCL_STOP
                   }
                 },
                 rhs);