Cargo sometimes thinks that an unfresh project is fresh

[TyOverby]

Inside my project called my-piston-project, running cargo build twice in a row yields interesting results. After editing a file, I ran cargo build and it said that my project is fresh. Without doing anything else, I ran cargo build again and it correctly recompiled.

ty@ty-VirtualBox:~/workspace/personal/rust/piston-tutorial$ cargo build
       Fresh gl v0.0.1 (https://github.com/bjz/gl-rs)
       Fresh piston v0.0.0 (https://github.com/PistonDevelopers/piston)
       Fresh glfw v0.0.1 (https://github.com/bjz/glfw-rs)
       Fresh glfw_game_window v0.0.0 (https://github.com/PistonDevelopers/glfw_game_window.git)
       Fresh image v0.0.0 (https://github.com/PistonDevelopers/rust-image)
       Fresh graphics v0.0.0 (https://github.com/PistonDevelopers/rust-graphics.git)
       Fresh opengl_graphics v0.0.0 (https://github.com/PistonDevelopers/opengl_graphics.git)
       Fresh my-piston-project v0.0.0 (file:/home/ty/workspace/personal/rust/piston-tutorial)
ty@ty-VirtualBox:~/workspace/personal/rust/piston-tutorial$ cargo build
       Fresh gl v0.0.1 (https://github.com/bjz/gl-rs)
       Fresh image v0.0.0 (https://github.com/PistonDevelopers/rust-image)
       Fresh graphics v0.0.0 (https://github.com/PistonDevelopers/rust-graphics.git)
       Fresh opengl_graphics v0.0.0 (https://github.com/PistonDevelopers/opengl_graphics.git)
       Fresh piston v0.0.0 (https://github.com/PistonDevelopers/piston)
       Fresh glfw v0.0.1 (https://github.com/bjz/glfw-rs)
       Fresh glfw_game_window v0.0.0 (https://github.com/PistonDevelopers/glfw_game_window.git)
   Compiling my-piston-project v0.0.0 (file:/home/ty/workspace/personal/rust/piston-tutorial)

This is the 3rd or 4th time this has happened to me, but because I tried to force it to recompile other times (by touching files in the project) there wasn't a clear bug.

[alexcrichton]

Much of the management around freshness has seem some recent improvements, is this still an issue?

[TyOverby]

Ok. I'll close it for now because it's basically impossible to reliably reproduce. If I see it again I'll reopen.