Setup

Versions

• Rust: latest stable (1.45.2)
• Diesel: latest master (8d3c955)
• Database:
• Operating System: ArchLinux

Feature Flags

• diesel: /

Problem Description

As of 8d3c955 (#2182), diesel takes forever to compile when default features are enabled.

What are you trying to accomplish?

git clone --single-branch https://github.com/diesel-rs/diesel.git
cd diesel/diesel
cargo check --no-default-features --features "32-column-tables"

What is the expected output?

Compiles successfully

What is the actual output?

After ~1h with 64-column-tables (And so far, 15m with 32-column-tables)

    Updating crates.io index
   Compiling proc-macro2 v1.0.19
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.38
   Compiling byteorder v1.3.4
    Checking itoa v0.4.6
   Compiling quote v1.0.7
   Compiling diesel_derives v2.0.0 (/path/to/diesel/diesel_derives)
    Checking diesel v2.0.0 (/path/to/diesel/diesel)
^C  Building [===================================================>     ] 13/14: diesel

Are you seeing any additional errors?

no