Scheme Environment

Scheme is specified by Revised3 Report on Scheme. T3 provides the environment SCHEME-ENV which supports some subset of Scheme.

The Scheme interpreter is entered using SCHEME-RESET and SCHEME-BREAKPOINT, and is left using T-RESET.

$\begin{inset}{} Enters a Scheme read-eval-print-loop in the Scheme environment. Similar to the {\bf T} procedure {\mbox {{\tt BREAKPOINT}}}. \end{inset}$

$\begin{inset}{} Enters a top level Scheme read-eval-print-loop in the Scheme env... ...{\mbox {{\tt SCHEME-BREAKPOINT}}} followed by {\mbox {{\tt RESET}}}. \end{inset}$

$\begin{inset}{} Enters a top level {\bf T} read-eval-print-loop in the {\bf T} {\mbox {{\tt USER-ENV}}}. \end{inset}$

When in Scheme, RESET is rebound to SCHEME-RESET.

$\begin{inset}{} Transfers control directally to the top-level Scheme read-eval-print loop by performing a throw. \end{inset}$

Switching between SCHEME-ENV and USER-ENV does not alter the bindings made in SCHEME-ENV.

The value of symbols in the SCHEME-ENV can be accessed from other environments using *VALUE, but it is not posible to do the reverse from SCHEME-ENV.