altos: Support negative decimal values on command line
authorKeith Packard <keithp@keithp.com>
Fri, 16 Oct 2020 19:57:07 +0000 (12:57 -0700)
committerKeith Packard <keithp@keithp.com>
Fri, 16 Oct 2020 19:57:07 +0000 (12:57 -0700)
Add support for leading unary minus for decimal constants.

Signed-off-by: Keith Packard <keithp@keithp.com>

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