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Improve suggestion for missing fmt str in println

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Avoid using `concat!(fmt, "\n")` to improve the diagnostics being
emitted when the first `println!()` argument isn't a formatting string
literal.
This commit is contained in:
Esteban Küber 2018-07-14 20:50:30 -07:00 • committed by Esteban Küber
parent bc14d71622
commit f53c145ef1
14 changed files with 122 additions and 102 deletions
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14
src/test/ui/const-eval/conditional_array_execution.nll.stderr
View file

@ -28,25 +28,19 @@ LL | println!("{}", FOO);
| ^^^ referenced constant has errors
error[E0080]: referenced constant has errors
--> $DIR/conditional_array_execution.rs:19:5
--> $DIR/conditional_array_execution.rs:19:14
|
LL | const FOO: u32 = [X - Y, Y - X][(X < Y) as usize];
| ----- attempt to subtract with overflow
...
LL | println!("{}", FOO);
| ^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^
error[E0080]: erroneous constant used
--> $DIR/conditional_array_execution.rs:19:5
--> $DIR/conditional_array_execution.rs:19:14
|
LL | println!("{}", FOO);
| ^^^^^^^^^^^^^^^---^^
| |
| referenced constant has errors
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^ --- referenced constant has errors
error[E0080]: referenced constant has errors
--> $DIR/conditional_array_execution.rs:19:20

14
src/test/ui/const-eval/issue-43197.nll.stderr
View file

@ -51,25 +51,19 @@ LL | println!("{} {}", X, Y);
| ^ referenced constant has errors
error[E0080]: referenced constant has errors
--> $DIR/issue-43197.rs:24:5
--> $DIR/issue-43197.rs:24:14
|
LL | const X: u32 = 0-1;
| --- attempt to subtract with overflow
...
LL | println!("{} {}", X, Y);
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^^^^
error[E0080]: erroneous constant used
--> $DIR/issue-43197.rs:24:5
--> $DIR/issue-43197.rs:24:14
|
LL | println!("{} {}", X, Y);
| ^^^^^^^^^^^^^^^^^^-^^^^^
| |
| referenced constant has errors
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^^^^ - referenced constant has errors
error[E0080]: referenced constant has errors
--> $DIR/issue-43197.rs:24:26

14
src/test/ui/const-eval/issue-44578.nll.stderr
View file

@ -1,23 +1,17 @@
error[E0080]: referenced constant has errors
--> $DIR/issue-44578.rs:35:5
--> $DIR/issue-44578.rs:35:14
|
LL | const AMT: usize = [A::AMT][(A::AMT > B::AMT) as usize];
| ------------------------------------ index out of bounds: the len is 1 but the index is 1
...
LL | println!("{}", <Bar<u16, u8> as Foo>::AMT);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^
error[E0080]: erroneous constant used
--> $DIR/issue-44578.rs:35:5
--> $DIR/issue-44578.rs:35:14
|
LL | println!("{}", <Bar<u16, u8> as Foo>::AMT);
| ^^^^^^^^^^^^^^^--------------------------^^
| |
| referenced constant has errors
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ^^^^ -------------------------- referenced constant has errors
error[E0080]: referenced constant has errors
--> $DIR/issue-44578.rs:35:20

2
src/test/ui/fmt/format-string-error.rs
View file

@ -10,8 +10,10 @@
fn main() {
println!("{");
//~^ ERROR invalid format string: expected `'}'` but string was terminated
println!("{{}}");
println!("}");
//~^ ERROR invalid format string: unmatched `}` found
let _ = format!("{_foo}", _foo = 6usize);
//~^ ERROR invalid format string: invalid argument name `_foo`
let _ = format!("{_}", _ = 6usize);

20
src/test/ui/fmt/format-string-error.stderr
View file

@ -1,23 +1,21 @@
error: invalid format string: expected `'}'` but string was terminated
--> $DIR/format-string-error.rs:12:5
--> $DIR/format-string-error.rs:12:16
|
LL | println!("{");
| ^^^^^^^^^^^^^^ expected `'}'` in format string
| ^ expected `'}'` in format string
|
= note: if you intended to print `{`, you can escape it using `{{`
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
error: invalid format string: unmatched `}` found
--> $DIR/format-string-error.rs:14:5
--> $DIR/format-string-error.rs:15:15
|
LL | println!("}");
| ^^^^^^^^^^^^^^ unmatched `}` in format string
| ^ unmatched `}` in format string
|
= note: if you intended to print `}`, you can escape it using `}}`
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
error: invalid format string: invalid argument name `_foo`
--> $DIR/format-string-error.rs:15:23
--> $DIR/format-string-error.rs:17:23
|
LL | let _ = format!("{_foo}", _foo = 6usize);
| ^^^^ invalid argument name in format string
@ -25,7 +23,7 @@ LL | let _ = format!("{_foo}", _foo = 6usize);
= note: argument names cannot start with an underscore
error: invalid format string: invalid argument name `_`
--> $DIR/format-string-error.rs:17:23
--> $DIR/format-string-error.rs:19:23
|
LL | let _ = format!("{_}", _ = 6usize);
| ^ invalid argument name in format string
@ -33,7 +31,7 @@ LL | let _ = format!("{_}", _ = 6usize);
= note: argument names cannot start with an underscore
error: invalid format string: expected `'}'` but string was terminated
--> $DIR/format-string-error.rs:19:23
--> $DIR/format-string-error.rs:21:23
|
LL | let _ = format!("{");
| ^ expected `'}'` in format string
@ -41,7 +39,7 @@ LL | let _ = format!("{");
= note: if you intended to print `{`, you can escape it using `{{`
error: invalid format string: unmatched `}` found
--> $DIR/format-string-error.rs:21:22
--> $DIR/format-string-error.rs:23:22
|
LL | let _ = format!("}");
| ^ unmatched `}` in format string
@ -49,7 +47,7 @@ LL | let _ = format!("}");
= note: if you intended to print `}`, you can escape it using `}}`
error: invalid format string: expected `'}'`, found `'/'`
--> $DIR/format-string-error.rs:23:23
--> $DIR/format-string-error.rs:25:23
|
LL | let _ = format!("{/}");
| ^ expected `}` in format string

5
src/test/ui/macros/bad_hello.rs
View file

@ -9,5 +9,8 @@
// except according to those terms.
fn main() {
println!(3 + 4); //~ ERROR expected a literal
println!(3 + 4);
//~^ ERROR format argument must be a string literal
println!(3, 4);
//~^ ERROR format argument must be a string literal
}

20
src/test/ui/macros/bad_hello.stderr
View file

@ -1,12 +1,22 @@
error: expected a literal
error: format argument must be a string literal
--> $DIR/bad_hello.rs:12:14
|
LL | println!(3 + 4); //~ ERROR expected a literal
LL | println!(3 + 4);
| ^^^^^
help: you might be missing a string literal to format with
|
LL | println!("{}", 3 + 4); //~ ERROR expected a literal
| ^^^^^^^^^^^
LL | println!("{}", 3 + 4);
| ^^^^^
error: aborting due to previous error
error: format argument must be a string literal
--> $DIR/bad_hello.rs:14:14
|
LL | println!(3, 4);
| ^
help: you might be missing a string literal to format with
|
LL | println!("{}, {}", 3, 4);
| ^^^^^^^^^
error: aborting due to 2 previous errors

5
src/test/ui/macros/format-foreign.stderr
View file

@ -2,12 +2,13 @@ error: multiple unused formatting arguments
--> $DIR/format-foreign.rs:12:30
|
LL | println!("%.*3$s %s!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
| -------------------------^^^^^^^^--^^^^^^^--^-- multiple unused arguments in this statement
| -------------- ^^^^^^^^ ^^^^^^^ ^
| |
| multiple missing formatting arguments
|
= help: `%.*3$s` should be written as `{:.2$}`
= help: `%s` should be written as `{}`
= note: printf formatting not supported; see the documentation for `std::fmt`
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
error: argument never used
--> $DIR/format-foreign.rs:13:29

43
src/test/ui/macros/format-unused-lables.stderr
View file

@ -2,24 +2,21 @@ error: multiple unused formatting arguments
--> $DIR/format-unused-lables.rs:12:22
|
LL | println!("Test", 123, 456, 789);
| -----------------^^^--^^^--^^^-- multiple unused arguments in this statement
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
| ------ ^^^ ^^^ ^^^
| |
| multiple missing formatting arguments
error: multiple unused formatting arguments
--> $DIR/format-unused-lables.rs:16:9
|
LL | / println!("Test2",
LL | | 123, //~ ERROR multiple unused formatting arguments
| | ^^^
LL | | 456,
| | ^^^
LL | | 789
| | ^^^
LL | | );
| |______- multiple unused arguments in this statement
|
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
LL | println!("Test2",
| ------- multiple missing formatting arguments
LL | 123, //~ ERROR multiple unused formatting arguments
| ^^^
LL | 456,
| ^^^
LL | 789
| ^^^
error: named argument never used
--> $DIR/format-unused-lables.rs:21:35
@ -30,18 +27,18 @@ LL | println!("Some stuff", UNUSED="args"); //~ ERROR named argument never u
error: multiple unused formatting arguments
--> $DIR/format-unused-lables.rs:24:9
|
LL | / println!("Some more $STUFF",
LL | | "woo!", //~ ERROR multiple unused formatting arguments
| | ^^^^^^
LL | | STUFF=
LL | | "things"
| | ^^^^^^^^
LL | | , UNUSED="args");
| |_______________________^^^^^^_- multiple unused arguments in this statement
LL | println!("Some more $STUFF",
| ------------------ multiple missing formatting arguments
LL | "woo!", //~ ERROR multiple unused formatting arguments
| ^^^^^^
LL | STUFF=
LL | "things"
| ^^^^^^^^
LL | , UNUSED="args");
| ^^^^^^
|
= help: `$STUFF` should be written as `{STUFF}`
= note: shell formatting not supported; see the documentation for `std::fmt`
= note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
error: aborting due to 4 previous errors

9
src/test/ui/macros/trace-macro.stderr
View file

@ -5,8 +5,9 @@ LL | println!("Hello, World!");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: expanding `println! { "Hello, World!" }`
= note: to `print ! ( concat ! ( "Hello, World!" , "/n" ) )`
= note: expanding `print! { concat ! ( "Hello, World!" , "/n" ) }`
= note: to `$crate :: io :: _print ( format_args ! ( concat ! ( "Hello, World!" , "/n" ) )
)`
= note: to `{ print ! ( "Hello, World!" ) ; print ! ( "/n" ) ; }`
= note: expanding `print! { "Hello, World!" }`
= note: to `$crate :: io :: _print ( format_args ! ( "Hello, World!" ) )`
= note: expanding `print! { "/n" }`
= note: to `$crate :: io :: _print ( format_args ! ( "/n" ) )`