Compiler panic while building datetimeformat example in intro.md

[dminor]

With the version of the datetimeformat example in intro.md from #1895, I get a compiler panic when building locally:

dminor@treebeard:~/src/icu-temp/myapp$ cargo build
   Compiling myapp v0.1.0 (/home/dminor/src/icu-temp/myapp)
thread 'rustc' panicked at 'assertion failed: !new_self_ty.has_escaping_bound_vars()', compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs:1688:9

[robertbastian]

I believe this is fixed in 1.61: rust-lang/rust#96223

[sffc]

@dminor Did you verify whether the update to 1.61 resolves the issue?

[sffc]

@dminor Could you verify if this is fixed?

[dminor]

Yes, it's fixed, although I think the example code needs to be updated to reflect recent changes.

[sffc]

Cool, thanks for confirming. I opened #2281 to track tutorial updates for 1.0 (surprised we didn't already have an issue for that).