Pattern: Missing space after {
Issue: -
{ is only recognized as the start of a command group when it's a separate token.
If it's not a separate token, like in the problematic example, it will be considered a literal character, as if writing "{echo" with quotes, and therefore usually cause a syntax error.
Example of incorrect code:
foo() {echo "hello world;}Example of correct code:
foo() { echo "hello world;}