Auto merge of #69260 - GuillaumeGomez:create-E0747-error-code, r=varkor,estebank

Create E0747 error code for unterminated raw strings

Reopening of #66035.

r? @estebank

1 files changed, 16 insertions, 0 deletions

diff --git a/src/librustc_error_codes/error_codes/E0748.md b/src/librustc_error_codes/error_codes/E0748.md
new file mode 100644
index 00000000000..69f1c026125
--- /dev/null
+++ b/src/librustc_error_codes/error_codes/E0748.md
@@ -0,0 +1,16 @@
+A raw string isn't correctly terminated because the trailing `#` count doesn't
+match its leading `#` count.
+
+Erroneous code example:
+
+```compile_fail,E0748
+let dolphins = r##"Dolphins!"#; // error!
+```
+
+To terminate a raw string, you have to have the same number of `#` at the end
+as at the beginning. Example:
+
+```
+let dolphins = r#"Dolphins!"#; // One `#` at the beginning, one at the end so
+                               // all good!
+```