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Rollup merge of #52649 - estebank:fmt-span, r=oli-obk

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Point spans to inner elements of format strings

- Point at missing positional specifiers in string literal
```
error: invalid reference to positional arguments 3, 4 and 5 (there are 3 arguments)
  --> $DIR/ifmt-bad-arg.rs:34:38
   |
LL |     format!("{name} {value} {} {} {} {} {} {}", 0, name=1, value=2);
   |                                      ^^ ^^ ^^
   |
   = note: positional arguments are zero-based
```

- Point at named formatting specifier in string literal
```
error: there is no argument named `foo`
  --> $DIR/ifmt-bad-arg.rs:37:17
   |
LL |     format!("{} {foo} {} {bar} {}", 1, 2, 3);
   |                 ^^^^^
```

- Update label for formatting string in "multiple unused formatting arguments" to be more correct
```
error: multiple unused formatting arguments
  --> $DIR/ifmt-bad-arg.rs:42:17
   |
LL |     format!("", 1, 2);               //~ ERROR: multiple unused formatting arguments
   |             --  ^  ^
   |             |
   |             multiple missing formatting specifiers
```

- When using `printf` string formatting, provide a structured suggestion instead of a note
```
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 missing formatting specifiers
   |
   = note: printf formatting not supported; see the documentation for `std::fmt`
help: format specifiers in Rust are written using `{}`
   |
LL |     println!("{:.2$} {}!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
   |               ^^^^^^ ^^
```
This commit is contained in:
Mark Rousskov 2018-07-26 09:18:30 -06:00 • committed by GitHub
commit 2aec4e882c
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8 changed files with 494 additions and 116 deletions
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5
src/test/ui/macros/format-foreign.rs
View file

@ -11,6 +11,11 @@
fn main() {
println!("%.*3$s %s!\n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
println!("%1$*2$.*3$f", 123.456); //~ ERROR never used
println!(r###"%.*3$s
%s!\n
"###, "Hello,", "World", 4);
//~^ ERROR multiple unused formatting arguments
// correctly account for raw strings in inline suggestions
// This should *not* produce hints, on the basis that there's equally as
// many "correct" format specifiers. It's *probably* just an actual typo.

41
src/test/ui/macros/format-foreign.stderr
View file

@ -4,29 +4,52 @@ error: multiple unused formatting arguments
LL | println!("%.*3$s %s!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
| -------------- ^^^^^^^^ ^^^^^^^ ^
| |
| multiple missing formatting arguments
| multiple missing formatting specifiers
|
= help: `%.*3$s` should be written as `{:.2$}`
= help: `%s` should be written as `{}`
= note: printf formatting not supported; see the documentation for `std::fmt`
help: format specifiers use curly braces
|
LL | println!("{:.2$} {}!/n", "Hello,", "World", 4); //~ ERROR multiple unused formatting arguments
| ^^^^^^ ^^
error: argument never used
--> $DIR/format-foreign.rs:13:29
|
LL | println!("%1$*2$.*3$f", 123.456); //~ ERROR never used
| ^^^^^^^
| ----------- ^^^^^^^
| |
| help: format specifiers use curly braces: `{0:1$.2$}`
|
= help: `%1$*2$.*3$f` should be written as `{0:1$.2$}`
= note: printf formatting not supported; see the documentation for `std::fmt`
error: multiple unused formatting arguments
--> $DIR/format-foreign.rs:16:7
|
LL | println!(r###"%.*3$s
| ______________-
LL | | %s!/n
LL | | "###, "Hello,", "World", 4);
| | - ^^^^^^^^ ^^^^^^^ ^
| |____|
| multiple missing formatting specifiers
|
= note: printf formatting not supported; see the documentation for `std::fmt`
help: format specifiers use curly braces
|
LL | println!(r###"{:.2$}
LL | {}!/n
|
error: argument never used
--> $DIR/format-foreign.rs:17:30
--> $DIR/format-foreign.rs:22:30
|
LL | println!("{} %f", "one", 2.0); //~ ERROR never used
| ^^^
| ------- ^^^
| |
| formatting specifier missing
error: named argument never used
--> $DIR/format-foreign.rs:19:39
--> $DIR/format-foreign.rs:24:39
|
LL | println!("Hi there, $NAME.", NAME="Tim"); //~ ERROR never used
| ^^^^^
@ -34,5 +57,5 @@ LL | println!("Hi there, $NAME.", NAME="Tim"); //~ ERROR never used
= help: `$NAME` should be written as `{NAME}`
= note: shell formatting not supported; see the documentation for `std::fmt`
error: aborting due to 4 previous errors
error: aborting due to 5 previous errors

10
src/test/ui/macros/format-unused-lables.stderr
View file

@ -4,13 +4,13 @@ error: multiple unused formatting arguments
LL | println!("Test", 123, 456, 789);
| ------ ^^^ ^^^ ^^^
| |
| multiple missing formatting arguments
| multiple missing formatting specifiers
error: multiple unused formatting arguments
--> $DIR/format-unused-lables.rs:16:9
|
LL | println!("Test2",
| ------- multiple missing formatting arguments
| ------- multiple missing formatting specifiers
LL | 123, //~ ERROR multiple unused formatting arguments
| ^^^
LL | 456,
@ -22,13 +22,15 @@ error: named argument never used
--> $DIR/format-unused-lables.rs:21:35
|
LL | println!("Some stuff", UNUSED="args"); //~ ERROR named argument never used
| ^^^^^^
| ------------ ^^^^^^
| |
| formatting specifier missing
error: multiple unused formatting arguments
--> $DIR/format-unused-lables.rs:24:9
|
LL | println!("Some more $STUFF",
| ------------------ multiple missing formatting arguments
| ------------------ multiple missing formatting specifiers
LL | "woo!", //~ ERROR multiple unused formatting arguments
| ^^^^^^
LL | STUFF=