parser: check orm sql statements, using undefined variables in where expr (fix #13367) (#13368)

vlib/v/checker/tests/orm_using_undefined_var_in_where_err.out

@@ -0,0 +1,7 @@
+vlib/v/checker/tests/orm_using_undefined_var_in_where_err.vv:24:35: error: undefined variable: `email`
+   22 |
+   23 |     _ := sql db {
+   24 |         select from User where email == email
+      |                                         ~~~~~
+   25 |     }
+   26 | }

vlib/v/checker/tests/orm_using_undefined_var_in_where_err.vv

@@ -0,0 +1,26 @@
+import time
+import sqlite
+
+struct User {
+	id         int       [primary; sql: serial]
+	created_at time.Time
+	updated_at time.Time
+	email      string
+	password   string
+	name       string
+}
+
+fn main() {
+	db := sqlite.connect(':memory:') ?
+	sql db {
+		create table User
+	}
+	m := User{}
+	sql db {
+		insert m into User
+	}
+
+	_ := sql db {
+		select from User where email == email
+	}
+}

vlib/v/parser/sql.v

@@ -38,6 +38,13 @@ fn (mut p Parser) sql_expr() ast.Expr {
 					query_one = true
 				}
 			}
+			if e.right is ast.Ident {
+				if !p.scope.known_var(e.right.name) {
+					p.check_undefined_variables([e.left], e.right) or {
+						return p.error_with_pos(err.msg, e.right.pos)
+					}
+				}
+			}
 		}
 	}
 	mut has_limit := false