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auto merge of #13936 : Armavica/rust/lint_check-range, r=kballard

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Some cases were not correctly handled by this lint, for instance `let a = 42u8; a < 0` and `let a = 42u8; a > 255`.
It led to the discovery of two useless comparisons, which I removed.
This commit is contained in:
bors 2014-05-05 01:41:39 -07:00
commit dcde1ee163
4 changed files with 18 additions and 8 deletions
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8
src/librustc/middle/lint.rs
View File

@ -788,10 +788,10 @@ fn check_type_limits(cx: &Context, e: &ast::Expr) {
fn is_valid<T:cmp::Ord>(binop: ast::BinOp, v: T,
min: T, max: T) -> bool {
match binop {
ast::BiLt => v <= max,
ast::BiLe => v < max,
ast::BiGt => v >= min,
ast::BiGe => v > min,
ast::BiLt => v > min && v <= max,
ast::BiLe => v >= min && v < max,
ast::BiGt => v >= min && v < max,
ast::BiGe => v > min && v <= max,
ast::BiEq | ast::BiNe => v >= min && v <= max,
_ => fail!()
}

2
src/libsyntax/ext/format.rs
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@ -268,7 +268,7 @@ impl<'a, 'b> Context<'a, 'b> {
fn verify_arg_type(&mut self, arg: Position, ty: ArgumentType) {
match arg {
Exact(arg) => {
if arg < 0 || self.args.len() <= arg {
if self.args.len() <= arg {
let msg = format!("invalid reference to argument `{}` (there \
are {} arguments)", arg, self.args.len());
self.ecx.span_err(self.fmtsp, msg);

4
src/libterm/terminfo/parser/compiled.rs
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@ -220,9 +220,7 @@ pub fn parse(file: &mut io::Reader,
if bools_bytes != 0 {
for i in range(0, bools_bytes) {
let b = try!(file.read_byte());
if b < 0 {
return Err("error: expected more bools but hit EOF".to_owned());
} else if b == 1 {
if b == 1 {
bools_map.insert(bnames[i as uint].to_owned(), true);
}
}

12
src/test/compile-fail/lint-type-limits.rs
View File

@ -29,6 +29,18 @@ fn baz() -> bool {
//~^ WARNING literal out of range for its type
}
fn bleh() {
let u = 42u8;
let _ = u > 255; //~ ERROR comparison is useless due to type limits
let _ = 255 < u; //~ ERROR comparison is useless due to type limits
let _ = u < 0; //~ ERROR comparison is useless due to type limits
let _ = 0 > u; //~ ERROR comparison is useless due to type limits
let _ = u <= 255; //~ ERROR comparison is useless due to type limits
let _ = 255 >= u; //~ ERROR comparison is useless due to type limits
let _ = u >= 0; //~ ERROR comparison is useless due to type limits
let _ = 0 <= u; //~ ERROR comparison is useless due to type limits
}
fn qux() {
let mut i = 1i8;
while 200 != i { //~ ERROR comparison is useless due to type limits