1 files changed, 131 insertions, 0 deletions
diff --git a/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/unresolved_method.rs b/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/unresolved_method.rs
new file mode 100644
index 000000000..f3ec6efa7
--- /dev/null
+++ b/src/tools/rust-analyzer/crates/ide-diagnostics/src/handlers/unresolved_method.rs
@@ -0,0 +1,131 @@
+use hir::{db::ExpandDatabase, HirDisplay};
+use ide_db::{
+    assists::{Assist, AssistId, AssistKind},
+    base_db::FileRange,
+    label::Label,
+    source_change::SourceChange,
+};
+use syntax::{ast, AstNode, TextRange};
+use text_edit::TextEdit;
+
+use crate::{Diagnostic, DiagnosticsContext};
+
+// Diagnostic: unresolved-method
+//
+// This diagnostic is triggered if a method does not exist on a given type.
+pub(crate) fn unresolved_method(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedMethodCall,
+) -> Diagnostic {
+    let field_suffix = if d.field_with_same_name.is_some() {
+        ", but a field with a similar name exists"
+    } else {
+        ""
+    };
+    Diagnostic::new(
+        "unresolved-method",
+        format!(
+            "no method `{}` on type `{}`{field_suffix}",
+            d.name,
+            d.receiver.display(ctx.sema.db)
+        ),
+        ctx.sema.diagnostics_display_range(d.expr.clone().map(|it| it.into())).range,
+    )
+    .with_fixes(fixes(ctx, d))
+    .experimental()
+}
+
+fn fixes(ctx: &DiagnosticsContext<'_>, d: &hir::UnresolvedMethodCall) -> Option<Vec<Assist>> {
+    if let Some(ty) = &d.field_with_same_name {
+        field_fix(ctx, d, ty)
+    } else {
+        // FIXME: add quickfix
+        None
+    }
+}
+
+fn field_fix(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedMethodCall,
+    ty: &hir::Type,
+) -> Option<Vec<Assist>> {
+    if !ty.impls_fnonce(ctx.sema.db) {
+        return None;
+    }
+    let expr_ptr = &d.expr;
+    let root = ctx.sema.db.parse_or_expand(expr_ptr.file_id)?;
+    let expr = expr_ptr.value.to_node(&root);
+    let (file_id, range) = match expr {
+        ast::Expr::MethodCallExpr(mcall) => {
+            let FileRange { range, file_id } =
+                ctx.sema.original_range_opt(mcall.receiver()?.syntax())?;
+            let FileRange { range: range2, file_id: file_id2 } =
+                ctx.sema.original_range_opt(mcall.name_ref()?.syntax())?;
+            if file_id != file_id2 {
+                return None;
+            }
+            (file_id, TextRange::new(range.start(), range2.end()))
+        }
+        _ => return None,
+    };
+    Some(vec![Assist {
+        id: AssistId("expected-method-found-field-fix", AssistKind::QuickFix),
+        label: Label::new("Use parentheses to call the value of the field".to_string()),
+        group: None,
+        target: range,
+        source_change: Some(SourceChange::from_iter([
+            (file_id, TextEdit::insert(range.start(), "(".to_owned())),
+            (file_id, TextEdit::insert(range.end(), ")".to_owned())),
+        ])),
+        trigger_signature_help: false,
+    }])
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::{check_diagnostics, check_fix};
+
+    #[test]
+    fn smoke_test() {
+        check_diagnostics(
+            r#"
+fn main() {
+    ().foo();
+ // ^^^^^^^^ error: no method `foo` on type `()`
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn field() {
+        check_diagnostics(
+            r#"
+struct Foo { bar: i32 }
+fn foo() {
+    Foo { bar: i32 }.bar();
+ // ^^^^^^^^^^^^^^^^^^^^^^ error: no method `bar` on type `Foo`, but a field with a similar name exists
+}
+"#,
+        );
+    }
+
+    #[test]
+    fn callable_field() {
+        check_fix(
+            r#"
+//- minicore: fn
+struct Foo { bar: fn() }
+fn foo() {
+    Foo { bar: foo }.b$0ar();
+}
+"#,
+            r#"
+struct Foo { bar: fn() }
+fn foo() {
+    (Foo { bar: foo }.bar)();
+}
+"#,
+        );
+    }
+}