Incorrect "no condition signaled"

[cgay]

This assertion was passing:

  assert-signals(<invalid-string-literal>,
                 read-fragment("\"\t\""),
                 "Tab not allowed in string literal");

and I changed it to this because I wanted to see it fail:

  assert-signals(<integer-too-large>,
                 read-fragment("\"\t\""),
                 "Tab not allowed in string literal");

and then I got this as a result:

      Test string-literal-test:
        FAILED: Tab not allowed in string literal
          no condition signaled

I should've seen something like "<invalid-string-literal> was signaled instead of the expected <integer-too-large>."