test: check each overload compiles

tests/test_parse_file.cpp

@@ -889,3 +889,32 @@ BOOST_AUTO_TEST_CASE(test_files_end_with_empty_lines)
     }
 }
 
+
+BOOST_AUTO_TEST_CASE(test_parse_function_compiles)
+{
+    // toml::parse("");
+    const auto string_literal = toml::parse("toml/tests/example.toml");
+
+    const char* fname_cstring = "toml/tests/example.toml";
+    // toml::parse(const char*);
+    const auto cstring = toml::parse(fname_cstring);
+
+    // toml::parse(char*);
+    char* fname_char_ptr = new char[24];
+    std::strncpy(fname_char_ptr, fname_cstring, 24u);
+    const auto char_ptr = toml::parse(fname_char_ptr);
+
+    // toml::parse(const std::string&);
+    const std::string fname_string("toml/tests/example.toml");
+    const auto string = toml::parse(fname_string);
+    std::string fname_string_mut("toml/tests/example.toml");
+    // toml::parse(std::string&);
+    const auto string_mutref = toml::parse(fname_string_mut);
+    // toml::parse(std::string&&);
+    const auto string_rref = toml::parse(std::move(fname_string_mut));
+
+#ifdef TOML11_HAS_STD_FILESYSTEM
+    const std::filesystem::path fname_path(fname_string.begin(), fname_string.end());
+    const auto filesystem_path = toml::parse(fname_path);
+#endif
+}