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Improve diagnostics for mismatched type in async main #3039

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Improve diagnostics for mismatched type in async main #3039

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8 changes: 7 additions & 1 deletion tokio-macros/src/entry.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -240,15 +240,21 @@ fn parse_knobs(
}
};

let ret_ty = &sig.output;

let result = quote! {
#header
#(#attrs)*
#vis #sig {
// Asssert the return type here,
// which produces a better diagnostic
async fn main_inner() #ret_ty #body

#rt
.enable_all()
.build()
.unwrap()
.block_on(async { #body })
.block_on(main_inner())
}
};

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