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Improve help for recursion limit errors

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Ross MacArthur 2021-09-28 22:16:42 +02:00
parent 8f8092cc32
commit d2613fb7a5
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GPG key ID: 06D0DC3998527584
26 changed files with 75 additions and 35 deletions
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8
compiler/rustc_expand/src/expand.rs
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@ -633,14 +633,18 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
fn error_recursion_limit_reached(&mut self) {
let expn_data = self.cx.current_expansion.id.expn_data();
let suggested_limit = self.cx.ecfg.recursion_limit * 2;
let suggested_limit = match self.cx.ecfg.recursion_limit {
Limit(0) => Limit(2),
limit => limit * 2,
};
self.cx
.struct_span_err(
expn_data.call_site,
&format!("recursion limit reached while expanding `{}`", expn_data.kind.descr()),
)
.help(&format!(
"consider adding a `#![recursion_limit=\"{}\"]` attribute to your crate (`{}`)",
"consider increasing the recursion limit by adding a \
`#![recursion_limit = \"{}\"]` attribute to your crate (`{}`)",
suggested_limit, self.cx.ecfg.crate_name,
))
.emit();