ecpg rejects input parameters

PostgreSQL uses a :colon syntax for parameterizing SQL commands with command line variables.

create-database.sql:

CREATE DATABASE :db;

Usage:

$ psql -f create-database.sql -v db=test

However, pgsanity/ecpg rejects these.

$ pgsanity create-database.sql
line 1: ERROR: syntax error at or near ":db"

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