Goofy error if I forgot to put quotes around immediate-abort

[saethlin]

Problem

I mistakenly tried to use this manifest:

[package]
name = "scratch"
version = "0.1.0"
edition = "2024"

[dependencies]

[profile.release]
panic = immediate-abort

Which (correctly) fails to parse with this (silly) error:

error: invalid float, expected `inf`
 --> Cargo.toml:9:9
  |
9 | panic = immediate-abort
  |         ^^^^^^^^^^^^^^^

I'd rather see a suggestion that I put quotes around the value. The field is supposed to be a String after all. Right? 🤞

cargo 1.94.0-nightly (94c368ad2 2025-12-26)
release: 1.94.0-nightly
commit-hash: 94c368ad2b9db0f0da5bdd8421cea13786ce4412
commit-date: 2025-12-26
host: aarch64-apple-darwin
libgit2: 1.9.1 (sys:0.20.2 vendored)
libcurl: 8.7.1 (sys:0.4.83+curl-8.15.0 system ssl:(SecureTransport) LibreSSL/3.3.6)
ssl: OpenSSL 3.5.4 30 Sep 2025
os: Mac OS 26.2.0 [64-bit]

[epage]

The parser saw i and assumed you had meant inf. If it started with most other letters, it would have said that unquoted strings are not allowed.

This gets into a question of how smart the error recovery should be and would likely best be discussed at https://github.com/toml-rs/toml