julia-version-compat

Flag syntax newer than the project’s declared Julia support range. Fatou parses the full superset of Julia syntax, so a construct from a newer release parses cleanly even when the project targets an older version; this rule reports when a supported version predates the construct (e.g. public needs 1.11, import ... as needs 1.6). The target range is taken from --julia-version, [julia] version, or the project’s Project.toml [compat] / Manifest.toml; with no target known the rule stays silent.

Targeting Julia 1.0, but public needs 1.11 and as needs 1.6:

module M
public foo
import A as B
end

error: julia-version-compat
 --> example.jl:2:1
  |
2 | public foo
  | ^^^^^^^^^^ the `public` keyword requires Julia 1.11.0, but the project supports 1.0.0 and up
error: julia-version-compat
 --> example.jl:3:8
  |
3 | import A as B
  |        ^^^^^^ renaming with `as` in `import`/`using` requires Julia 1.6.0, but the project supports 1.0.0 and up