Schema generation results in invalid decorators in 2.1

[thomasmost]

Versions

• Rust: 1.7.1
• Diesel: 2.1
• Database: MySQL
• Operating System MacOS

Feature Flags

• diesel: ["mysql", "extras", "chrono", "r2d2"]

Problem Description

Generating the table definitions for tables with both sql_renames of reserved words and max lengths results in a schema.rs file that won't compile

What are you trying to accomplish?

generating a table with a migration like so creates an invalid table definition in schema.rs

CREATE TABLE `my_table` (
  `id` char(36) NOT NULL,
  `type` varchar(50) NOT NULL,
  PRIMARY KEY (`id`)
);

What is the expected output?

diesel::table! {
    my_table (id) {
        #[max_length = 36]
        id -> Char,
        #[sql_name = "type"]
        #[max_length = 50]
        type_ -> Varchar,
    }
}

What is the actual output?

diesel::table! {
    offsets_bill (id) {
        #[max_length = 36]
        id -> Char,
        #[sql_name = "type", max_length = 50]
        type_ -> Varchar,
    }
}

Are you seeing any additional errors?

This causes

Invalid table!syntax. Please see thetable! macro docs for more info.

Steps to reproduce

Checklist

• I have already looked over the issue tracker and the discussion forum for similar possible closed issues.

• This issue can be reproduced on Rust's stable channel. (Your issue will be
  closed if this is not the case)
• This issue can be reproduced without requiring a third party crate

[weiznich]

Duplicate of #3681