src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/unresolved_import.rs

   1 use crate::{Diagnostic, DiagnosticsContext};
   2
   3 // Diagnostic: unresolved-import
   4 //
   5 // This diagnostic is triggered if rust-analyzer is unable to resolve a path in
   6 // a `use` declaration.
   7 pub(crate) fn unresolved_import(
   8     ctx: &DiagnosticsContext<'_>,
   9     d: &hir::UnresolvedImport,
  10 ) -> Diagnostic {
  11     Diagnostic::new(
  12         "unresolved-import",
  13         "unresolved import",
  14         ctx.sema.diagnostics_display_range(d.decl.clone().map(|it| it.into())).range,
  15     )
  16     // This currently results in false positives in the following cases:
  17     // - `cfg_if!`-generated code in libstd (we don't load the sysroot correctly)
  18     // - `core::arch` (we don't handle `#[path = "../<path>"]` correctly)
  19     // - proc macros and/or proc macro generated code
  20     .experimental()
  21 }
  22
  23 #[cfg(test)]
  24 mod tests {
  25     use crate::tests::check_diagnostics;
  26
  27     #[test]
  28     fn unresolved_import() {
  29         check_diagnostics(
  30             r#"
  31 use does_exist;
  32 use does_not_exist;
  33   //^^^^^^^^^^^^^^ error: unresolved import
  34
  35 mod does_exist {}
  36 "#,
  37         );
  38     }
  39
  40     #[test]
  41     fn unresolved_import_in_use_tree() {
  42         // Only the relevant part of a nested `use` item should be highlighted.
  43         check_diagnostics(
  44             r#"
  45 use does_exist::{Exists, DoesntExist};
  46                        //^^^^^^^^^^^ error: unresolved import
  47
  48 use {does_not_exist::*, does_exist};
  49    //^^^^^^^^^^^^^^^^^ error: unresolved import
  50
  51 use does_not_exist::{
  52     a,
  53   //^ error: unresolved import
  54     b,
  55   //^ error: unresolved import
  56     c,
  57   //^ error: unresolved import
  58 };
  59
  60 mod does_exist {
  61     pub struct Exists;
  62 }
  63 "#,
  64         );
  65     }
  66
  67     #[test]
  68     fn dedup_unresolved_import_from_unresolved_crate() {
  69         check_diagnostics(
  70             r#"
  71 //- /main.rs crate:main
  72 mod a {
  73     extern crate doesnotexist;
  74   //^^^^^^^^^^^^^^^^^^^^^^^^^^ error: unresolved extern crate
  75
  76     // Should not error, since we already errored for the missing crate.
  77     use doesnotexist::{self, bla, *};
  78
  79     use crate::doesnotexist;
  80       //^^^^^^^^^^^^^^^^^^^ error: unresolved import
  81 }
  82
  83 mod m {
  84     use super::doesnotexist;
  85       //^^^^^^^^^^^^^^^^^^^ error: unresolved import
  86 }
  87 "#,
  88         );
  89     }
  90 }