Trailing newlines affect spans

[FabianWolff]

Trailing newlines affect the locations and spans of error messages. For instance:

echo -n '#[i=i::a' > test.rs

produces (when compiling test.rs with rustc):

error: this file contains an unclosed delimiter
 --> test.rs:1:9
  |
1 | #[i=i::a
  |  -      ^
  |  |
  |  unclosed delimiter

error: expected item after attributes
 --> test.rs:1:1
  |
1 | #[i=i::a
  | ^^^^^^^^

error: aborting due to 2 previous errors

Which is what I would expect. However, the same code with a trailing newline:

echo '#[i=i::a' > test.rs

produces:

error: this file contains an unclosed delimiter
 --> test.rs:1:10
  |
1 | #[i=i::a
  |  -       ^
  |  |
  |  unclosed delimiter

error: expected item after attributes
 --> test.rs:1:1
  |
1 | #[i=i::a
  | ^^^^^^^^^

error: aborting due to 2 previous errors

where the first error message points to nowhere (position test.rs:1:10 does not exist), and the span of the second error message is too wide by one character. This initially confused me quite a bit, because it looks like an invisible character in the source file, or an issue with a multibyte character or something. I think that the trailing newline should either be ignored, or that the error should locate EOF in line 2 (and not 1, after the newline, which is at test.rs:1:9).