feat(errors): add stable error propagation

2026-08-23 00:40:17 +03:00
1 parent 97acb2a2d7
commit ba9c97ed3b
@@ -0,0 +1,8 @@
+use kaptan_err_propagate_macros::propagate;
+
+#[propagate(report)]
+fn invalid() -> Result<(), ()> {
+    Ok(())
+}
+
+fn main() {}
@@ -0,0 +1,7 @@
+error: kaptan_err_propagate::propagate does not accept arguments
+ --> tests/ui/arguments.rs:3:1
+  |
+3 | #[propagate(report)]
+  | ^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in the attribute macro `propagate` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -0,0 +1,8 @@
+use kaptan_err_propagate_macros::propagate;
+
+#[propagate]
+const fn invalid() -> Result<(), ()> {
+    Ok(())
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: kaptan_err_propagate::propagate does not support const functions
+ --> tests/ui/const_fn.rs:4:1
+  |
+4 | const fn invalid() -> Result<(), ()> {
+  | ^^^^^
@@ -0,0 +1,13 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Debug, KaptanError)]
+enum DuplicateId {
+    #[kaptan_error(id = 42)]
+    First,
+    #[kaptan_error(id = 42)]
+    Second,
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: Kaptan error ID 42 is already assigned to variant First
+  --> tests/ui/duplicate_id.rs:10:5
+   |
+10 |     Second,
+   |     ^^^^^^
@@ -0,0 +1,37 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Clone, Copy)]
+pub struct ErrorId(u16);
+
+impl ErrorId {
+    pub const fn new(id: u16) -> Self {
+        Self(id)
+    }
+
+    pub const fn get(self) -> u16 {
+        self.0
+    }
+}
+
+pub trait ErrorReport {
+    fn error_id(&self) -> ErrorId;
+}
+
+#[derive(Debug, KaptanError)]
+enum FirstError {
+    #[kaptan_error(id = 77)]
+    Failed,
+}
+
+#[derive(Debug, KaptanError)]
+enum SecondError {
+    #[kaptan_error(id = 77)]
+    Failed,
+}
+
+fn main() {
+    let _ = FirstError::Failed.error_id();
+    let _ = SecondError::Failed.error_id();
+}
@@ -0,0 +1,7 @@
+error: symbol `__kaptan_error_id_77` is already defined
+  --> tests/ui/duplicate_id_across_enums.rs:28:17
+   |
+28 | #[derive(Debug, KaptanError)]
+   |                 ^^^^^^^^^^^
+   |
+   = note: this error originates in the derive macro `KaptanError` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -0,0 +1,43 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Clone, Copy)]
+pub struct ErrorId(u16);
+
+impl ErrorId {
+    pub const fn new(id: u16) -> Self {
+        Self(id)
+    }
+
+    pub const fn get(self) -> u16 {
+        self.0
+    }
+}
+
+pub trait ErrorReport {
+    fn error_id(&self) -> ErrorId;
+}
+
+#[derive(Debug, KaptanError)]
+enum Generic<'a, T>
+where
+    T: Copy,
+{
+    #[kaptan_error(id = 65201)]
+    Unit,
+    #[kaptan_error(id = 65202)]
+    Tuple(T, u8),
+    #[kaptan_error(id = 65203)]
+    Named { label: &'a str },
+}
+
+fn main() {
+    fn assert_error<T: core::error::Error>() {}
+    assert_error::<Generic<'_, u8>>();
+    assert_eq!(Generic::<u8>::Unit.error_id().get(), 65201);
+    assert_eq!(Generic::Tuple(1_u8, 2).error_id().get(), 65202);
+    let named: Generic<'_, u8> = Generic::Named { label: "test" };
+    assert_eq!(named.error_id().get(), 65203);
+    assert_eq!(named.to_string(), "65203");
+}
@@ -0,0 +1,10 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Debug, KaptanError)]
+enum MissingId {
+    Variant,
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: missing `#[kaptan_error(id = ...)]` on Kaptan error variant
+ --> tests/ui/missing_id.rs:7:5
+  |
+7 |     Variant,
+  |     ^^^^^^^
@@ -0,0 +1,6 @@
+use kaptan_err_propagate_macros::propagate;
+
+#[propagate]
+fn invalid() {}
+
+fn main() {}
@@ -0,0 +1,7 @@
+error: kaptan_err_propagate::propagate requires an explicit Result<T, E> return type
+ --> tests/ui/missing_return.rs:3:1
+  |
+3 | #[propagate]
+  | ^^^^^^^^^^^^
+  |
+  = note: this error originates in the attribute macro `propagate` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -0,0 +1,18 @@
+use kaptan_err_propagate_macros::propagate;
+
+extern crate self as kaptan_err_propagate;
+
+pub trait ErrorReport {}
+
+pub mod __private {
+    pub fn report_result<T, E: crate::ErrorReport>(_: &Result<T, E>, _: &'static str) {}
+}
+
+struct PlainError;
+
+#[propagate]
+fn invalid() -> Result<(), PlainError> {
+    Err(PlainError)
+}
+
+fn main() {}
@@ -0,0 +1,17 @@
+error[E0277]: the trait bound `PlainError: ErrorReport` is not satisfied
+  --> tests/ui/no_error_report.rs:13:1
+   |
+13 | #[propagate]
+   | ^^^^^^^^^^^^ the trait `ErrorReport` is not implemented for `PlainError`
+   |
+help: this trait has no implementations, consider adding one
+  --> tests/ui/no_error_report.rs:5:1
+   |
+ 5 | pub trait ErrorReport {}
+   | ^^^^^^^^^^^^^^^^^^^^^
+note: required by a bound in `report_result`
+  --> tests/ui/no_error_report.rs:8:32
+   |
+ 8 |     pub fn report_result<T, E: crate::ErrorReport>(_: &Result<T, E>, _: &'static str) {}
+   |                                ^^^^^^^^^^^^^^^^^^ required by this bound in `report_result`
+   = note: this error originates in the attribute macro `propagate` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -0,0 +1,14 @@
+use kaptan_err_propagate_macros::propagate;
+
+extern crate self as kaptan_err_propagate;
+
+pub mod __private {
+    pub fn report_result<T, E>(_: &Result<T, E>, _: &'static str) {}
+}
+
+#[propagate]
+fn invalid() -> bool {
+    true
+}
+
+fn main() {}
@@ -0,0 +1,17 @@
+error[E0308]: mismatched types
+ --> tests/ui/non_result.rs:9:1
+  |
+9 | #[propagate]
+  | ^^^^^^^^^^^^
+  | |
+  | expected `&Result<_, _>`, found `&bool`
+  | arguments to this function are incorrect
+  |
+  = note: expected reference `&Result<_, _>`
+             found reference `&bool`
+note: function defined here
+ --> tests/ui/non_result.rs:6:12
+  |
+6 |     pub fn report_result<T, E>(_: &Result<T, E>, _: &'static str) {}
+  |            ^^^^^^^^^^^^^       ----------------
+  = note: this error originates in the attribute macro `propagate` (in Nightly builds, run with -Z macro-backtrace for more info)
@@ -0,0 +1,8 @@
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(KaptanError)]
+struct NotAnError {
+    code: u8,
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: KaptanError can only be derived for enums, not structs
+ --> tests/ui/struct.rs:4:8
+  |
+4 | struct NotAnError {
+  |        ^^^^^^^^^^
@@ -0,0 +1,8 @@
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(KaptanError)]
+union NotAnError {
+    code: u8,
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: KaptanError can only be derived for enums, not unions
+ --> tests/ui/union.rs:4:7
+  |
+4 | union NotAnError {
+  |       ^^^^^^^^^^
@@ -0,0 +1,8 @@
+use kaptan_err_propagate_macros::propagate;
+
+#[propagate]
+unsafe fn invalid() -> Result<(), ()> {
+    Ok(())
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: kaptan_err_propagate::propagate does not support unsafe functions
+ --> tests/ui/unsafe_fn.rs:4:1
+  |
+4 | unsafe fn invalid() -> Result<(), ()> {
+  | ^^^^^^
@@ -0,0 +1,11 @@
+extern crate self as kaptan_err_propagate;
+
+use kaptan_err_propagate_macros::KaptanError;
+
+#[derive(Debug, KaptanError)]
+enum ZeroId {
+    #[kaptan_error(id = 0)]
+    Variant,
+}
+
+fn main() {}
@@ -0,0 +1,5 @@
+error: Kaptan error ID zero is reserved
+ --> tests/ui/zero_id.rs:7:25
+  |
+7 |     #[kaptan_error(id = 0)]
+  |                         ^