diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 42 |
1 files changed, 35 insertions, 7 deletions
@@ -19190,7 +19190,7 @@ replaced by .coNP Function @ eval .synb -.mets (eval < form <> [ env ]) +.mets (eval < form >> [ env <> [ menv ]]) .syne .desc The @@ -19199,12 +19199,36 @@ function treats the .meta form object as a Lisp expression, which is expanded and evaluated. The side effects implied by the form are performed, and the value -which it produces is returned. The optional +which it produces is returned. + +The optional +.meta env +argument specifies an environment for +resolving the function and variable references encountered in +.metn form . +If this argument is omitted, then evaluation takes place in the global +environment. + +The optional +.meta menv +object specifies a macro environment for expanding macros encountered in +.metn form . +If this argument is omitted, then +.meta form +may refer to only global macros. + +If both +.meta menv +and +.meta env +are specified, then +.meta env +takes precedence over +.metn menv , +behaving like a more nested scope. Definitions contained in .meta env -object specifies an environment for -resolving the function and variable references encountered in the expression. -If this argument is omitted, -then evaluation takes place in the global environment. +shadow same-named definitions in +.metn menv . The .meta form @@ -19214,7 +19238,11 @@ is not expanded all at once. Rather, it is treated by the following algorithm: First, if .meta form is a macro, it is macro-expanded as if by an application of the function -.codn macroexpand . +.code macroexpand +(with a suitable environment argument, calculated by a combination of +.meta env +and +.metn menv ). .IP 2. If the resulting expanded form is a .codn progn , |