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| author | Andy Russell <arussell123@gmail.com> | 2018-12-03 20:45:25 -0500 |
|---|---|---|
| committer | Andy Russell <arussell123@gmail.com> | 2018-12-04 10:22:48 -0500 |
| commit | a367cec6e355a0b17d611acba5577ee72c228971 (patch) | |
| tree | 36f3e2decf2f8e272649d2b2d40e1df6b9e32f63 /src/libsyntax_ext/assert.rs | |
| parent | 9cd3bef4cfaaac2a608682d4b0834cda344249e0 (diff) | |
| download | rust-a367cec6e355a0b17d611acba5577ee72c228971.tar.gz rust-a367cec6e355a0b17d611acba5577ee72c228971.zip | |
emit error with span for empty asserts
Fixes #55547.
Diffstat (limited to 'src/libsyntax_ext/assert.rs')
| -rw-r--r-- | src/libsyntax_ext/assert.rs | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/libsyntax_ext/assert.rs b/src/libsyntax_ext/assert.rs index e3bd2ca0131..a2384b59048 100644 --- a/src/libsyntax_ext/assert.rs +++ b/src/libsyntax_ext/assert.rs @@ -24,6 +24,14 @@ pub fn expand_assert<'cx>( tts: &[TokenTree], ) -> Box<dyn MacResult + 'cx> { let mut parser = cx.new_parser_from_tts(tts); + + if parser.token == token::Eof { + cx.struct_span_err(sp, "macro requires a boolean expression as an argument") + .span_label(sp, "boolean expression required") + .emit(); + return DummyResult::expr(sp); + } + let cond_expr = panictry!(parser.parse_expr()); let custom_msg_args = if parser.eat(&token::Comma) { let ts = parser.parse_tokens(); |