Captured identifiers in SQL strings

Initial draft

rusqlite-macros/tests/test.rs

@@ -0,0 +1,22 @@
+use rusqlite_macros::__bind;
+
+#[test]
+fn test_literal() {
+    let stmt = ();
+    __bind!(stmt, "SELECT $name");
+}
+
+/* FIXME
+#[test]
+fn test_raw_string() {
+    let stmt = ();
+    __bind!((), r#"SELECT 1"#);
+}
+
+#[test]
+fn test_const() {
+    const SQL: &str = "SELECT 1";
+    let stmt = ();
+    __bind!((), SQL);
+}
+*/