Bug in subst: If a \[ follows a $, variables stop being interpolated

[jrpat]

Admittedly obscure, but it bit me today.

Example jimsh repl session (with notes and newlines added for readability):

Welcome to Jim version 0.82
. set x 123
123

. subst {$\[foo] $x}
$[foo] $x                       ← error - simplest case

. subst {\[foo] $x}
[foo] 123                       ← ok - no dollar sign

. subst {$ \[foo] $x}
$ [foo] $x                      ← error - space after dollar sign

. subst {$  \[foo] $x}
$  [foo] $x                     ← error  - multiple spaces after dollar sign

. puts "$\[foo] $x"
$[foo] 123                      ← ok  - string interpolation works

. set y 789
789

. subst {$\[foo] $x $y}
$[foo] $x $y                    ← error - multiple variables

. subst {$\[foo] ${x} ${y}}
$[foo] ${x} ${y}                ← error - bracing variable names doesn't help

. subst {$\[foo]
{> $x
{> $y
{> }
$[foo]
$x
$y                              ← error - multiple lines

. subst {\$\[foo] $x}
$[foo] 123                      ← ok  - escaping dollar sign

. subst {$x $y $\[foo] $x $y}
123 789 $[foo] $x $y            ← error - following variables don't interpolate

The same session in tclsh:

% set x 123
123

% subst {$\[foo] $x}
$[foo] 123

% subst {\[foo] $x}
[foo] 123

… further examples show correct output …

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I 💜 Jim! Thanks again for all your work on it.

[msteveb]

Thanks for the report. Fixed!