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feat(errors): Don't panic if annotating a non-struct/enum

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This also improves the error spans when there's an internal
error.

Closes #206.
This commit is contained in:
Erick Tryzelaar
2016-01-16 14:51:11 -08:00
parent 342ea25290
commit 979a4bcd88
2 changed files with 40 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files
serde_codegen/src/ser.rs
+16 -6
View File
@@ -25,7 +25,7 @@ pub fn expand_derive_serialize(
_ => {
cx.span_err(
meta_item.span,
"`derive` may only be applied to structs and enums");
"`#[derive(Serialize)]` may only be applied to structs and enums");
return;
}
};
@@ -35,7 +35,12 @@ pub fn expand_derive_serialize(
let generics = match item.node {
ast::ItemStruct(_, ref generics) => generics,
ast::ItemEnum(_, ref generics) => generics,
_ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Serialize)]")
_ => {
cx.span_err(
meta_item.span,
"`#[derive(Serialize)]` may only be applied to structs and enums");
return;
}
};
let impl_generics = builder.from_generics(generics.clone())
@@ -86,6 +91,7 @@ fn serialize_body(
item,
impl_generics,
ty,
item.span,
variant_data,
)
}
@@ -99,7 +105,10 @@ fn serialize_body(
enum_def,
)
}
_ => cx.bug("expected ItemStruct or ItemEnum in #[derive(Serialize)]")
_ => {
cx.span_bug(item.span,
"expected ItemStruct or ItemEnum in #[derive(Serialize)]")
}
}
}
@@ -109,6 +118,7 @@ fn serialize_item_struct(
item: &Item,
impl_generics: &ast::Generics,
ty: P<ast::Ty>,
span: Span,
variant_data: &ast::VariantData,
) -> P<ast::Expr> {
match *variant_data {
@@ -128,7 +138,7 @@ fn serialize_item_struct(
}
ast::VariantData::Tuple(ref fields, _) => {
if fields.iter().any(|field| !field.node.kind.is_unnamed()) {
cx.bug("tuple struct has named fields")
cx.span_bug(span, "tuple struct has named fields")
}
serialize_tuple_struct(
@@ -142,7 +152,7 @@ fn serialize_item_struct(
}
ast::VariantData::Struct(ref fields, _) => {
if fields.iter().any(|field| field.node.kind.is_unnamed()) {
cx.bug("struct has unnamed fields")
cx.span_bug(span, "struct has unnamed fields")
}
serialize_struct(
@@ -367,7 +377,7 @@ fn serialize_variant(
let name = match field.node.kind {
ast::NamedField(name, _) => name,
ast::UnnamedField(_) => {
cx.bug("struct variant has unnamed fields")
cx.span_bug(field.span, "struct variant has unnamed fields")
}
};