Provide more context for unenclosed delimiters

* When encountering EOF, point at the last opening brace that does not
   have the same indentation level as its close delimiter.
 * When encountering the wrong type of close delimiter, point at the
   likely correct open delimiter to give a better idea of what went
   wrong.

src/libsyntax/parse/lexer/mod.rs

@@ -66,6 +66,10 @@ pub struct StringReader<'a> {
     /// The raw source span which *does not* take `override_span` into account
     span_src_raw: Span,
     open_braces: Vec<(token::DelimToken, Span)>,
+    /// The type and spans for all braces that have different indentation.
+    ///
+    /// Used only for error recovery when arriving to EOF with mismatched braces.
+    suspicious_open_spans: Vec<(token::DelimToken, Span, Span)>,
     crate override_span: Option<Span>,
     last_unclosed_found_span: Option<Span>,
 }
@@ -216,6 +220,7 @@ impl<'a> StringReader<'a> {
             span: syntax_pos::DUMMY_SP,
             span_src_raw: syntax_pos::DUMMY_SP,
             open_braces: Vec::new(),
+            suspicious_open_spans: Vec::new(),
             override_span,
             last_unclosed_found_span: None,
         }