On the latest code from the devel branch:
GNU bash, versie 5.2.0(35)-alpha (x86_64-apple-darwin18.7.0)
Reproducer script:
shopt -s expand_aliases
alias let='let --'
set -x
let '1 == 1'
: $(let '1 == 1')
Output:
+ let -- '1 == 1'
++ let -- -- '1 == 1'
foo: line 5: let: --: syntax error: operand expected (error token is "-")
+ :
The alias is incorrectly expanded in the command substitution,
duplicating the '--' argument and causing a syntax error.
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