Fix parsing of labeled break statements #84
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When JuliaSyntax parses 'break label' statements where the label name is a keyword like 'error' or 'done', it creates Expr(:error, :label) nodes that look like parse errors but are actually just label references. This was causing false positive parse errors when running Julia 1.11 with JuliaSyntax to parse Julia 1.14+ source code containing constructs like '@Label error begin ... break error ... end'.
The fix updates has_embedded_errors() to distinguish between real parse errors (Expr(:error) or Expr(:error, "message")) and false positives (Expr(:error, :symbol) from labeled breaks).
Fixes http://buildkite.com/julialang/julia-master-scheduled/builds/1425#019c1312-26d0-4716-8642-7ac68180293e