5134a04eaa
Some minor (English only) heroics are performed to print error messages like "5th rule of macro `m` is never used". The form "rule #5 of macro `m` is never used" is just as good and much simpler to implement.
48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
#![deny(unused_macro_rules)]
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// To make sure we are not hitting this
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#![deny(unused_macros)]
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// Most simple case
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macro_rules! num {
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(one) => { 1 };
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(two) => { 2 }; //~ ERROR: rule #2 of macro
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(three) => { 3 };
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(four) => { 4 }; //~ ERROR: rule #4 of macro
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}
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const _NUM: u8 = num!(one) + num!(three);
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// Check that allowing the lint works
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#[allow(unused_macro_rules)]
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macro_rules! num_allowed {
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(one) => { 1 };
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(two) => { 2 };
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(three) => { 3 };
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(four) => { 4 };
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}
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const _NUM_ALLOWED: u8 = num_allowed!(one) + num_allowed!(three);
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// Check that macro calls inside the macro trigger as usage
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macro_rules! num_rec {
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(one) => { 1 };
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(two) => {
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num_rec!(one) + num_rec!(one)
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};
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(three) => { //~ ERROR: rule #3 of macro
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num_rec!(one) + num_rec!(two)
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};
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(four) => { num_rec!(two) + num_rec!(two) };
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}
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const _NUM_RECURSIVE: u8 = num_rec!(four);
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// No error if the macro is being exported
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#[macro_export]
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macro_rules! num_exported {
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(one) => { 1 };
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(two) => { 2 };
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(three) => { 3 };
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(four) => { 4 };
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}
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const _NUM_EXPORTED: u8 = num_exported!(one) + num_exported!(three);
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fn main() {}
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