Rust maintainers have now explored the adoption challenges in their latest annual survey of nearly 4,000 developers across the world. Of those who use Rust full-time, most developers report working in back-end web applications, distributed systems, and embedded systems.
Asked why developers have stopped using Rust, the most common response is that the respondent's company doesn't use it, suggesting an adoption issue.
Other common reasons are the learning curve, a lack of necessary libraries, and a lack of integrated development environment (IDE) support.
The top issues that respondents say the Rust project could do to improve adoption of the language are better training and documentation, followed by better libraries, IDE integration, and improved compile times.
"Most indicated that Rust maturity – such as more libraries and complete learning resources and more mature production capabilities – would make Rust more appealing," the project noted.
The three most popular IDEs among developers who use Rust are Microsoft's Visual Studio Code (VS Code), followed by Vim and JetBrains' IntelliJ.
Just over half of developers who use Rust are building on Linux systems, while just under a quarter develop on Windows, and the same proportion develop on macOS.
The Rust project also has explored learning-curve challenges among developers. While 37% of Rust users feel productive within a month of using it, 21% say they do not yet feel productive.
"The results show the overriding problem hindering use of Rust is adoption," the Rust project said. "The learning curve continues to be a challenge – we appear to most need to improve our follow-through for intermediate users – but so are libraries and tooling."
However, one positive is that Rust daily use rose slightly from 25% last year to 27.63%, while daily or weekly use is up from 66.4% last year to 68.5%.
Another positive is that this year 82.8% of respondents say they use Rust compared with 75% in the 2018 survey. And this year, 7.1% said they don't currently use Rust but have in the past, versus 8% in that category last year.
Rust, which hails from Mozilla Research, has become popular with some developers, including those at Microsoft who are experimenting with Rust to reduce memory-related bugs in Windows components written in C and C++.
And Google has used Rust for components of Fuchsia, which some speculate could be the successor to Android. However, after Google assessed using Rust for Fuchsia, it decided not to support Rust for end-developers because none of its current end-developers uses it and it's not a widely used language.
That was despite the members of the Fuchsia Platform Source Tree having had a "positive implementation experience using Rust". Google also barred Rust from use in the Fuchsia's Zircon microkernel, which is "using a restricted set of technologies that have established industry track records of being used in production operating systems".