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ty.rs improve error feedback when const-eval errs during repeat count eval.

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This commit is contained in:
Felix S. Klock II 2015-03-28 18:47:08 +01:00
parent 2f7658a528
commit 7875dae83f
1 changed files with 5 additions and 4 deletions
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9
src/librustc/middle/ty.rs
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@ -6047,19 +6047,20 @@ pub fn eval_repeat_count(tcx: &ctxt, count_expr: &ast::Expr) -> usize {
"expected positive integer for repeat count, found {}",
found);
}
Err(_) => {
Err(err) => {
let err_description = err.description();
let found = match count_expr.node {
ast::ExprPath(None, ast::Path {
global: false,
ref segments,
..
}) if segments.len() == 1 =>
"variable",
format!("{}", "found variable"),
_ =>
"non-constant expression"
format!("but {}", err_description),
};
span_err!(tcx.sess, count_expr.span, E0307,
"expected constant integer for repeat count, found {}",
"expected constant integer for repeat count, {}",
found);
}
}